<?xml version="1.0"?>
<!--
  Core Subject Taxonomy for Mathematical Sciences Education
  From http://people.uncw.edu/hermanr/MathTax/ (2005-05-09)

  Converted to XML 2006-05-22 by Jasper Bedaux http://bedaux.net/jasper/
  For the Digitale Universiteit http://www.du.nl/
-->
<taxonomy>
  <taxon>
    <id>1</id><entry>Numbers and Computation</entry>
    <taxon>
      <id>1.1</id><entry>Number Concepts</entry>
      <taxon><id>1.1.1</id><entry>Natural</entry></taxon>
      <taxon><id>1.1.2</id><entry>Integers</entry></taxon>
      <taxon><id>1.1.3</id><entry>Rational</entry></taxon>
      <taxon><id>1.1.4</id><entry>Irrational</entry></taxon>
      <taxon><id>1.1.5</id><entry>Algebraic</entry></taxon>
      <taxon><id>1.1.6</id><entry>Real</entry></taxon>
      <taxon><id>1.1.7</id><entry>Complex</entry></taxon>
      <taxon>
        <id>1.1.8</id><entry>Famous Numbers</entry>
        <taxon><id>1.1.8.1</id><entry>0</entry></taxon>
        <taxon><id>1.1.8.2</id><entry>pi</entry></taxon>
        <taxon><id>1.1.8.3</id><entry>e</entry></taxon>
        <taxon><id>1.1.8.4</id><entry>i</entry></taxon>
        <taxon><id>1.1.8.5</id><entry>Golden Mean</entry></taxon>
      </taxon>
    </taxon>
    <taxon>
      <id>1.2</id><entry>Arithmetic</entry>
      <taxon>
        <id>1.2.1</id><entry>Operations</entry>
        <taxon><id>1.2.1.1</id><entry>Addition</entry></taxon>
        <taxon><id>1.2.1.2</id><entry>Subtraction</entry></taxon>
        <taxon><id>1.2.1.3</id><entry>Multiplication</entry></taxon>
        <taxon><id>1.2.1.4</id><entry>Division</entry></taxon>
        <taxon><id>1.2.1.5</id><entry>Roots</entry></taxon>
        <taxon><id>1.2.1.6</id><entry>Factorials</entry></taxon>
        <taxon><id>1.2.1.7</id><entry>Factoring</entry></taxon>
        <taxon><id>1.2.1.8</id><entry>Properties of Operations</entry></taxon>
        <taxon><id>1.2.1.9</id><entry>Estimation</entry></taxon>
      </taxon>
      <taxon>
        <id>1.2.2</id><entry>Fractions</entry>
        <taxon><id>1.2.2.1</id><entry>Addition</entry></taxon>
        <taxon><id>1.2.2.2</id><entry>Subtraction</entry></taxon>
        <taxon><id>1.2.2.3</id><entry>Multiplication</entry></taxon>
        <taxon><id>1.2.2.4</id><entry>Division</entry></taxon>
        <taxon><id>1.2.2.5</id><entry>Ratio and Proportion</entry></taxon>
        <taxon><id>1.2.2.6</id><entry>Equivalent Fractions</entry></taxon>
      </taxon>
      <taxon>
        <id>1.2.3</id><entry>Decimals</entry>
        <taxon><id>1.2.3.1</id><entry>Addition</entry></taxon>
        <taxon><id>1.2.3.2</id><entry>Subtraction</entry></taxon>
        <taxon><id>1.2.3.3</id><entry>Multiplication</entry></taxon>
        <taxon><id>1.2.3.4</id><entry>Division</entry></taxon>
        <taxon><id>1.2.3.5</id><entry>Percents</entry></taxon>
      </taxon>
      <taxon><id>1.2.4</id><entry>Comparison of numbers</entry></taxon>
      <taxon>
        <id>1.2.5</id><entry>Exponents</entry>
        <taxon><id>1.2.5.1</id><entry>Multiplication</entry></taxon>
        <taxon><id>1.2.5.2</id><entry>Division</entry></taxon>
        <taxon><id>1.2.5.3</id><entry>Powers</entry></taxon>
        <taxon><id>1.2.5.4</id><entry>Integer Exponents</entry></taxon>
        <taxon><id>1.2.5.5</id><entry>Rational Exponents</entry></taxon>
      </taxon>
    </taxon>
    <taxon>
      <id>1.3</id><entry>Patterns and Sequences</entry>
      <taxon><id>1.3.1</id><entry>Number Patterns</entry></taxon>
      <taxon><id>1.3.2</id><entry>Fibonacci Sequence</entry></taxon>
      <taxon><id>1.3.3</id><entry>Arithmetic Sequence</entry></taxon>
      <taxon><id>1.3.4</id><entry>Geometric Sequence</entry></taxon>
    </taxon>
    <taxon>
      <id>1.4</id><entry>Measurement</entry>
      <taxon><id>1.4.1</id><entry>Units of Measurement</entry>
        <taxon><id>1.4.1.1</id><entry>Metric System</entry></taxon>
        <taxon><id>1.4.1.2</id><entry>Standard Units</entry></taxon>
        <taxon><id>1.4.1.3</id><entry>Nonstandard Units</entry></taxon>
      </taxon>
      <taxon>
        <id>1.4.2</id><entry>Linear Measure</entry>
        <taxon><id>1.4.2.1</id><entry>Distance</entry></taxon>
        <taxon><id>1.4.2.2</id><entry>Circumference</entry></taxon>
        <taxon><id>1.4.2.3</id><entry>Perimeter</entry></taxon>
      </taxon>
      <taxon>
        <id>1.4.3</id><entry>Area</entry>
        <taxon><id>1.4.3.1</id><entry>Area of Polygons</entry></taxon>
        <taxon><id>1.4.3.2</id><entry>Area of Circles</entry></taxon>
        <taxon><id>1.4.3.3</id><entry>Surface Area</entry></taxon>
        <taxon><id>1.4.3.4</id><entry>Nonstandard Shapes</entry></taxon>
      </taxon>
      <taxon><id>1.4.4</id><entry>Volume</entry></taxon>
      <taxon><id>1.4.5</id><entry>Weight and Mass</entry></taxon>
      <taxon><id>1.4.6</id><entry>Temperature</entry></taxon>
      <taxon><id>1.4.7</id><entry>Time</entry></taxon>
      <taxon><id>1.4.8</id><entry>Speed</entry></taxon>
      <taxon><id>1.4.9</id><entry>Money</entry></taxon>
      <taxon><id>1.4.10</id><entry>Scale</entry></taxon>
    </taxon>
  </taxon>
  <taxon>
    <id>2</id><entry>Logic and Foundations</entry>
    <taxon>
      <id>2.1</id><entry>Logic</entry>
      <taxon><id>2.1.1</id><entry>Venn Diagrams</entry></taxon>
      <taxon><id>2.1.2</id><entry>Propositional and Predicate Logic</entry></taxon>
      <taxon><id>2.1.3</id><entry>Methods of Proof</entry></taxon>
    </taxon>
    <taxon>
      <id>2.2</id><entry>Set Theory</entry>
      <taxon><id>2.2.1</id><entry>Sets and Set Operations</entry></taxon>
      <taxon><id>2.2.2</id><entry>Relations and Functions</entry></taxon>
      <taxon><id>2.2.3</id><entry>Cardinality</entry></taxon>
      <taxon><id>2.2.4</id><entry>Axiom of Choice</entry></taxon>
    </taxon>
    <taxon><id>2.3</id><entry>Computability and Decidability</entry></taxon>
    <taxon><id>2.4</id><entry>Model Theory</entry></taxon>
  </taxon>
  <taxon>
    <id>3</id><entry>Algebra and Number Theory</entry>
    <taxon>
      <id>3.1</id><entry>Algebra</entry>
      <taxon><id>3.1.1</id><entry>Graphing Techniques</entry></taxon>
      <taxon><id>3.1.2</id><entry>Algebraic Manipulation</entry></taxon>
      <taxon>
        <id>3.1.3</id><entry>Functions</entry>
        <taxon><id>3.1.3.1</id><entry>Linear</entry></taxon>
        <taxon><id>3.1.3.2</id><entry>Quadratic</entry></taxon>
        <taxon><id>3.1.3.3</id><entry>Polynomial</entry></taxon>
        <taxon><id>3.1.3.4</id><entry>Rational</entry></taxon>
        <taxon><id>3.1.3.5</id><entry>Exponential</entry></taxon>
        <taxon><id>3.1.3.6</id><entry>Logarithmic</entry></taxon>
        <taxon><id>3.1.3.7</id><entry>Piece-wise</entry></taxon>
        <taxon><id>3.1.3.8</id><entry>Step</entry></taxon>
      </taxon>
      <taxon>
        <id>3.1.4</id><entry>Equations</entry>
        <taxon><id>3.1.4.1</id><entry>Linear</entry></taxon>
        <taxon><id>3.1.4.2</id><entry>Quadratic</entry></taxon>
        <taxon><id>3.1.4.3</id><entry>Polynomial</entry></taxon>
        <taxon><id>3.1.4.4</id><entry>Rational</entry></taxon>
        <taxon><id>3.1.4.5</id><entry>Exponential</entry></taxon>
        <taxon><id>3.1.4.6</id><entry>Logarithmic</entry></taxon>
        <taxon><id>3.1.4.7</id><entry>Systems</entry></taxon>
      </taxon>
      <taxon><id>3.1.5</id><entry>Inequalities</entry></taxon>
      <taxon><id>3.1.6</id><entry>Matrices</entry></taxon>
      <taxon><id>3.1.7</id><entry>Sequences and Series</entry></taxon>
      <taxon><id>3.1.8</id><entry>Algebraic Proof</entry></taxon>
    </taxon>
    <taxon>
      <id>3.2</id><entry>Linear Algebra</entry>
      <taxon><id>3.2.1</id><entry>Systems of Linear Equations</entry></taxon>
      <taxon><id>3.2.2</id><entry>Matrix algebra</entry></taxon>
      <taxon><id>3.2.3</id><entry>Vectors in R3</entry></taxon>
      <taxon><id>3.2.4</id><entry>Vector Spaces</entry></taxon>
      <taxon><id>3.2.5</id><entry>Linear Transformations</entry></taxon>
      <taxon><id>3.2.6</id><entry>Eigenvalues and Eigenvectors</entry></taxon>
      <taxon><id>3.2.7</id><entry>Inner Product Spaces</entry></taxon>
    </taxon>
    <taxon>
      <id>3.3</id><entry>Abstract Algebra</entry>
      <taxon><id>3.3.1</id><entry>Groups</entry></taxon>
      <taxon><id>3.3.2</id><entry>Rings and Ideals</entry></taxon>
      <taxon><id>3.3.3</id><entry>Fields</entry></taxon>
      <taxon><id>3.3.4</id><entry>Galois Theory</entry></taxon>
      <taxon><id>3.3.5</id><entry>Multilinear Algebra</entry></taxon>
    </taxon>
    <taxon>
      <id>3.4</id><entry>Number Theory</entry>
      <taxon><id>3.4.1</id><entry>Integers</entry></taxon>
      <taxon>
        <id>3.4.2</id><entry>Primes</entry>
        <taxon><id>3.4.2.1</id><entry>Divisibility</entry></taxon>
        <taxon><id>3.4.2.2</id><entry>Factorization</entry></taxon>
        <taxon><id>3.4.2.3</id><entry>Distributions of Primes</entry></taxon>
      </taxon>
      <taxon><id>3.4.3</id><entry>Congruences</entry></taxon>
      <taxon><id>3.4.4</id><entry>Diophantine Equations</entry></taxon>
      <taxon><id>3.4.5</id><entry>Irrational Numbers</entry></taxon>
      <taxon><id>3.4.6</id><entry>Famous Problems</entry></taxon>
      <taxon><id>3.4.7</id><entry>Coding Theory</entry></taxon>
      <taxon><id>3.4.8</id><entry>Cryptography</entry></taxon>
    </taxon>
    <taxon><id>3.5</id><entry>Category Theory</entry></taxon>
    <taxon><id>3.6</id><entry>K-Theory</entry></taxon>
    <taxon><id>3.7</id><entry>Homological Algebra</entry></taxon>
    <taxon><id>3.8</id><entry>Modular Arithmetic</entry></taxon>
  </taxon>
  <taxon>
    <id>4</id><entry>Discrete Mathematics</entry>
    <taxon><id>4.1</id><entry>Cellular Automata</entry></taxon>
    <taxon>
      <id>4.2</id><entry>Combinatorics</entry>
      <taxon><id>4.2.1</id><entry>Combinations</entry></taxon>
      <taxon><id>4.2.2</id><entry>Permutations</entry></taxon>
    </taxon>
    <taxon><id>4.3</id><entry>Game Theory</entry></taxon>
    <taxon><id>4.4</id><entry>Algorithms</entry></taxon>
    <taxon><id>4.5</id><entry>Recursion</entry></taxon>
    <taxon><id>4.6</id><entry>Graph Theory</entry></taxon>
    <taxon><id>4.7</id><entry>Linear Programming</entry></taxon>
    <taxon><id>4.8</id><entry>Order and Lattices</entry></taxon>
    <taxon><id>4.9</id><entry>Theory of Computation</entry></taxon>
    <taxon><id>4.10</id><entry>Chaos</entry></taxon>
  </taxon>
  <taxon>
    <id>5</id><entry>Geometry and Topology</entry>
    <taxon><id>5.1</id><entry>Geometric Proof</entry></taxon>
    <taxon>
      <id>5.2</id><entry>Plane Geometry</entry>
      <taxon><id>5.2.1</id><entry>Measurement</entry></taxon>
      <taxon><id>5.2.2</id><entry>Lines and Planes</entry></taxon>
      <taxon><id>5.2.3</id><entry>Angles</entry></taxon>
      <taxon>
        <id>5.2.4</id><entry>Triangles</entry>
        <taxon><id>5.2.4.1</id><entry>Properties</entry></taxon>
        <taxon><id>5.2.4.2</id><entry>Congruence</entry></taxon>
        <taxon><id>5.2.4.3</id><entry>Similarity</entry></taxon>
        <taxon><id>5.2.4.4</id><entry>Pythagorean Theorem</entry></taxon>
      </taxon>
      <taxon>
        <id>5.2.5</id><entry>Polygons</entry>
        <taxon><id>5.2.5.1</id><entry>Properties</entry></taxon>
        <taxon><id>5.2.5.2</id><entry>Regular</entry></taxon>
        <taxon><id>5.2.5.3</id><entry>Irregular</entry></taxon>
        <taxon><id>5.2.5.4</id><entry>Congruence</entry></taxon>
        <taxon><id>5.2.5.5</id><entry>Similarity</entry></taxon>
      </taxon>
      <taxon><id>5.2.6</id><entry>Circles</entry></taxon>
      <taxon>
        <id>5.2.7</id><entry>Patterns</entry>
        <taxon><id>5.2.7.1</id><entry>Geometric Patterns</entry></taxon>
        <taxon><id>5.2.7.2</id><entry>Tilings and Tessellations</entry></taxon>
        <taxon><id>5.2.7.3</id><entry>Symmetry</entry></taxon>
        <taxon><id>5.2.7.4</id><entry>Golden Ratio</entry></taxon>
      </taxon>
      <taxon>
        <id>5.2.8</id><entry>Transformations</entry>
        <taxon><id>5.2.8.1</id><entry>Translation</entry></taxon>
        <taxon><id>5.2.8.2</id><entry>Rotation</entry></taxon>
        <taxon><id>5.2.8.3</id><entry>Reflection</entry></taxon>
        <taxon><id>5.2.8.4</id><entry>Scaling</entry></taxon>
      </taxon>
    </taxon>
    <taxon>
      <id>5.3</id><entry>Solid Geometry</entry>
      <taxon><id>5.3.1</id><entry>Dihedral Angles</entry></taxon>
      <taxon><id>5.3.2</id><entry>Spheres</entry></taxon>
      <taxon><id>5.3.3</id><entry>Cones</entry></taxon>
      <taxon><id>5.3.4</id><entry>Cylinders</entry></taxon>
      <taxon><id>5.3.5</id><entry>Pyramids</entry></taxon>
      <taxon><id>5.3.6</id><entry>Prisms</entry></taxon>
      <taxon><id>5.3.7</id><entry>Polyhedra</entry></taxon>
    </taxon>
    <taxon>
      <id>5.4</id><entry>Analytic Geometry</entry>
      <taxon><id>5.4.1</id><entry>Cartesian Coordinates</entry></taxon>
      <taxon><id>5.4.2</id><entry>Lines</entry></taxon>
      <taxon><id>5.4.3</id><entry>Circles</entry></taxon>
      <taxon><id>5.4.4</id><entry>Planes</entry></taxon>
      <taxon><id>5.4.5</id><entry>Conics</entry></taxon>
      <taxon><id>5.4.6</id><entry>Polar Coordinates</entry></taxon>
      <taxon><id>5.4.7</id><entry>Parametric Curves</entry></taxon>
      <taxon><id>5.4.8</id><entry>Surfaces</entry></taxon>
      <taxon><id>5.4.9</id><entry>Distance Formula</entry></taxon>
    </taxon>
    <taxon><id>5.5</id><entry>Projective Geometry</entry></taxon>
    <taxon><id>5.6</id><entry>Differential Geometry</entry></taxon>
    <taxon><id>5.7</id><entry>Algebraic Geometry</entry></taxon>
    <taxon>
      <id>5.8</id><entry>Topology</entry>
      <taxon><id>5.8.1</id><entry>Point Set Topology</entry></taxon>
      <taxon><id>5.8.2</id><entry>General Topology</entry></taxon>
      <taxon><id>5.8.3</id><entry>Differential Topology</entry></taxon>
      <taxon><id>5.8.4</id><entry>Algebraic Topology</entry></taxon>
    </taxon>
    <taxon>
      <id>5.9</id><entry>Trigonometry</entry>
      <taxon><id>5.9.1</id><entry>Angles</entry></taxon>
      <taxon><id>5.9.2</id><entry>Trigonometric Functions</entry></taxon>
      <taxon><id>5.9.3</id><entry>Inverse Trigonometric Functions</entry></taxon>
      <taxon><id>5.9.4</id><entry>Trigonometric Identities</entry></taxon>
      <taxon><id>5.9.5</id><entry>Trigonometric Equations</entry></taxon>
      <taxon><id>5.9.6</id><entry>Roots of Unity</entry></taxon>
      <taxon><id>5.9.7</id><entry>Spherical Trigonometry</entry></taxon>
    </taxon>
    <taxon><id>5.10</id><entry>Fractal Geometry</entry></taxon>
  </taxon>
  <taxon>
    <id>6</id><entry>Calculus</entry>
    <taxon>
      <id>6.1</id><entry>Single Variable</entry>
      <taxon><id>6.1.1</id><entry>Functions</entry></taxon>
      <taxon><id>6.1.2</id><entry>Limits</entry></taxon>
      <taxon><id>6.1.3</id><entry>Continuity</entry></taxon>
      <taxon><id>6.1.4</id><entry>Differentiation</entry></taxon>
      <taxon><id>6.1.5</id><entry>Integration</entry></taxon>
      <taxon><id>6.1.6</id><entry>Series</entry></taxon>
    </taxon>
    <taxon>
      <id>6.2</id><entry>Several Variables</entry>
      <taxon><id>6.2.1</id><entry>Functions of Several Variables</entry></taxon>
      <taxon><id>6.2.2</id><entry>Limits</entry></taxon>
      <taxon><id>6.2.3</id><entry>Continuity</entry></taxon>
      <taxon><id>6.2.4</id><entry>Partial Derivatives</entry></taxon>
      <taxon><id>6.2.5</id><entry>Multiple integrals</entry></taxon>
      <taxon><id>6.2.6</id><entry>Taylor Series</entry></taxon>
    </taxon>
    <taxon>
      <id>6.3</id><entry>Advanced Calculus</entry>
      <taxon><id>6.3.1</id><entry>Vector Valued Functions</entry></taxon>
      <taxon><id>6.3.2</id><entry>Line Integrals</entry></taxon>
      <taxon><id>6.3.3</id><entry>Surface Integrals</entry></taxon>
      <taxon><id>6.3.4</id><entry>Stokes Theorem</entry></taxon>
      <taxon><id>6.3.5</id><entry>Curvilinear Coordinates</entry></taxon>
      <taxon><id>6.3.6</id><entry>Linear spaces</entry></taxon>
      <taxon><id>6.3.7</id><entry>Fourier Series</entry></taxon>
      <taxon><id>6.3.8</id><entry>Orthogonal Functions</entry></taxon>
    </taxon>
    <taxon><id>6.4</id><entry>Tensor Calculus</entry></taxon>
    <taxon><id>6.5</id><entry>Calculus of Variations</entry></taxon>
    <taxon><id>6.6</id><entry>Operational Calculus</entry></taxon>
  </taxon>
  <taxon>
    <id>7</id><entry>Analysis</entry>
    <taxon>
      <id>7.1</id><entry>Real Analysis</entry>
      <taxon><id>7.1.1</id><entry>Metric Spaces</entry></taxon>
      <taxon><id>7.1.2</id><entry>Convergence</entry></taxon>
      <taxon><id>7.1.3</id><entry>Continuity</entry></taxon>
      <taxon><id>7.1.4</id><entry>Differentiation</entry></taxon>
      <taxon><id>7.1.5</id><entry>Integration</entry></taxon>
      <taxon><id>7.1.6</id><entry>Measure Theory</entry></taxon>
    </taxon>
    <taxon>
      <id>7.2</id><entry>Complex Analysis</entry>
      <taxon><id>7.2.1</id><entry>Convergence</entry></taxon>
      <taxon><id>7.2.2</id><entry>Infinite Series</entry></taxon>
      <taxon><id>7.2.3</id><entry>Analytic Functions</entry></taxon>
      <taxon><id>7.2.4</id><entry>Integration</entry></taxon>
      <taxon><id>7.2.5</id><entry>Contour Integrals</entry></taxon>
      <taxon><id>7.2.6</id><entry>Conformal Mappings</entry></taxon>
      <taxon><id>7.2.7</id><entry>Several Complex Variables</entry></taxon>
    </taxon>
    <taxon>
      <id>7.3</id><entry>Numerical Analysis</entry>
      <taxon><id>7.3.1</id><entry>Computer Arithmetic</entry></taxon>
      <taxon><id>7.3.2</id><entry>Solutions of Equations</entry></taxon>
      <taxon><id>7.3.3</id><entry>Solutions of Systems</entry></taxon>
      <taxon><id>7.3.4</id><entry>Interpolation</entry></taxon>
      <taxon><id>7.3.5</id><entry>Numerical Differentiation</entry></taxon>
      <taxon><id>7.3.6</id><entry>Numerical Integration</entry></taxon>
      <taxon><id>7.3.7</id><entry>Numerical Solutions of ODEs</entry></taxon>
      <taxon><id>7.3.8</id><entry>Numerical Solutions of PDEs</entry></taxon>
    </taxon>
    <taxon>
      <id>7.4</id><entry>Integral Transforms</entry>
      <taxon><id>7.4.1</id><entry>Fourier Transforms</entry></taxon>
      <taxon><id>7.4.2</id><entry>Laplace Transforms</entry></taxon>
      <taxon><id>7.4.3</id><entry>Hankel Transforms</entry></taxon>
      <taxon><id>7.4.4</id><entry>Wavelets</entry></taxon>
      <taxon><id>7.4.5</id><entry>Other Transforms</entry></taxon>
    </taxon>
    <taxon>
      <id>7.5</id><entry>Signal Analysis</entry>
      <taxon><id>7.5.1</id><entry>Sampling Theory</entry></taxon>
      <taxon><id>7.5.2</id><entry>Filters</entry></taxon>
      <taxon><id>7.5.3</id><entry>Noise</entry></taxon>
      <taxon><id>7.5.4</id><entry>Data Compression</entry></taxon>
      <taxon><id>7.5.5</id><entry>Image Processing</entry></taxon>
    </taxon>
    <taxon>
      <id>7.6</id><entry>Functional Analysis</entry>
      <taxon><id>7.6.1</id><entry>Hilbert Spaces</entry></taxon>
      <taxon><id>7.6.2</id><entry>Banach Spaces</entry></taxon>
      <taxon><id>7.6.3</id><entry>Topological Spaces</entry></taxon>
      <taxon><id>7.6.4</id><entry>Locally Convex Spaces</entry></taxon>
      <taxon><id>7.6.5</id><entry>Bounded Operators</entry></taxon>
      <taxon><id>7.6.6</id><entry>Spectral Theorem</entry></taxon>
      <taxon><id>7.6.7</id><entry>Unbounded Operators</entry></taxon>
    </taxon>
    <taxon><id>7.7</id><entry>Harmonic Analysis</entry></taxon>
    <taxon><id>7.8</id><entry>Global Analysis</entry></taxon>
  </taxon>
  <taxon>
    <id>8</id><entry>Differential and Difference Equations</entry>
    <taxon>
      <id>8.1</id><entry>Ordinary Differential Equations</entry>
      <taxon><id>8.1.1</id><entry>First Order</entry></taxon>
      <taxon><id>8.1.2</id><entry>Second Order</entry></taxon>
      <taxon><id>8.1.3</id><entry>Linear Oscillations</entry></taxon>
      <taxon><id>8.1.4</id><entry>Nonlinear Oscillations</entry></taxon>
      <taxon><id>8.1.5</id><entry>Systems of Differential Equations</entry></taxon>
      <taxon><id>8.1.6</id><entry>Sturm Liouville Problems</entry></taxon>
      <taxon><id>8.1.7</id><entry>Special Functions</entry></taxon>
      <taxon><id>8.1.8</id><entry>Power Series Methods</entry></taxon>
      <taxon><id>8.1.9</id><entry>Laplace Transforms</entry></taxon>
    </taxon>
    <taxon>
      <id>8.2</id><entry>Partial Differential Equations</entry>
      <taxon><id>8.2.1</id><entry>First Order</entry></taxon>
      <taxon><id>8.2.2</id><entry>Elliptic</entry></taxon>
      <taxon><id>8.2.3</id><entry>Parabolic</entry></taxon>
      <taxon><id>8.2.4</id><entry>Hyperbolic</entry></taxon>
      <taxon><id>8.2.5</id><entry>Integral Transforms</entry></taxon>
      <taxon><id>8.2.6</id><entry>Integral Equations</entry></taxon>
      <taxon><id>8.2.7</id><entry>Potential Theory</entry></taxon>
      <taxon><id>8.2.8</id><entry>Nonlinear Equations</entry></taxon>
      <taxon><id>8.2.9</id><entry>Symmetries and Integrability</entry></taxon>
    </taxon>
    <taxon>
      <id>8.3</id><entry>Difference Equations</entry>
      <taxon><id>8.3.1</id><entry>First Order</entry></taxon>
      <taxon><id>8.3.2</id><entry>Second Order</entry></taxon>
      <taxon><id>8.3.3</id><entry>Linear Systems</entry></taxon>
      <taxon><id>8.3.4</id><entry>Z Transforms</entry></taxon>
      <taxon><id>8.3.5</id><entry>Orthogonal Polynomials</entry></taxon>
    </taxon>
    <taxon>
      <id>8.4</id><entry>Dynamical Systems</entry>
      <taxon><id>8.4.1</id><entry>1D Maps</entry></taxon>
      <taxon><id>8.4.2</id><entry>2D Maps</entry></taxon>
      <taxon><id>8.4.3</id><entry>Lyapunov Exponents</entry></taxon>
      <taxon><id>8.4.4</id><entry>Bifurcations</entry></taxon>
      <taxon><id>8.4.5</id><entry>Fractals</entry></taxon>
      <taxon><id>8.4.6</id><entry>Differentiable Dynamics</entry></taxon>
      <taxon><id>8.4.7</id><entry>Conservative Dynamics</entry></taxon>
      <taxon><id>8.4.8</id><entry>Chaos</entry></taxon>
      <taxon><id>8.4.9</id><entry>Complex Dynamical Systems</entry></taxon>
    </taxon>
  </taxon>
  <taxon>
    <id>9</id><entry>Statistics and Probability</entry>
    <taxon>
      <id>9.1</id><entry>Data Collection</entry>
      <taxon><id>9.1.1</id><entry>Experimental Design</entry></taxon>
      <taxon><id>9.1.2</id><entry>Sampling and Surveys</entry></taxon>
      <taxon><id>9.1.3</id><entry>Data and Measurement Issues</entry></taxon>
    </taxon>
    <taxon>
      <id>9.2</id><entry>Data Summary and Presentation</entry>
      <taxon>
        <id>9.2.1</id><entry>Summary Statistics</entry>
        <taxon><id>9.2.1.1</id><entry>Measures of Central Tendency</entry></taxon>
        <taxon><id>9.2.1.2</id><entry>Measures of Spread</entry></taxon>
      </taxon>
      <taxon>
        <id>9.2.2</id><entry>Data Representation</entry>
        <taxon><id>9.2.2.1</id><entry>Graphs and Plots</entry></taxon>
        <taxon><id>9.2.2.2</id><entry>Tables</entry></taxon>
      </taxon>
    </taxon>
    <taxon>
      <id>9.3</id><entry>Statistical Inference and Techniques</entry>
      <taxon><id>9.3.1</id><entry>Sampling Distributions</entry></taxon>
      <taxon><id>9.3.2</id><entry>Regression and Correlation</entry></taxon>
      <taxon><id>9.3.3</id><entry>Confidence Intervals</entry></taxon>
      <taxon><id>9.3.4</id><entry>Hypothesis Tests</entry></taxon>
      <taxon><id>9.3.5</id><entry>Statistical Quality Control</entry></taxon>
      <taxon><id>9.3.6</id><entry>Non-parametric Techniques</entry></taxon>
      <taxon><id>9.3.7</id><entry>Multivariate Techniques</entry></taxon>
      <taxon><id>9.3.8</id><entry>Survival Analysis</entry></taxon>
      <taxon><id>9.3.9</id><entry>Bayesian Statistics</entry></taxon>
    </taxon>
    <taxon>
      <id>9.4</id><entry>Probability</entry>
      <taxon>
        <id>9.4.1</id><entry>Elementary Probability</entry>
        <taxon><id>9.4.1.1</id><entry>Sample Space and Events</entry></taxon>
        <taxon><id>9.4.1.2</id><entry>General Rules</entry></taxon>
        <taxon><id>9.4.1.3</id><entry>Combinations and Permutations</entry></taxon>
        <taxon><id>9.4.1.4</id><entry>Random Variables</entry></taxon>
      </taxon>
      <taxon>
        <id>9.4.2</id><entry>Univariate Distributions</entry>
        <taxon><id>9.4.2.1</id><entry>Discrete Distributions</entry></taxon>
        <taxon><id>9.4.2.2</id><entry>Continuous Distributions</entry></taxon>
        <taxon><id>9.4.2.3</id><entry>Expected Value</entry></taxon>
      </taxon>
      <taxon>
        <id>9.4.3</id><entry>Limit Theorems</entry>
        <taxon><id>9.4.3.1</id><entry>Central Limit Theorem</entry></taxon>
        <taxon><id>9.4.3.2</id><entry>Law of Large Numbers</entry></taxon>
      </taxon>
      <taxon>
        <id>9.4.4</id><entry>Multivariate Distributions</entry>
        <taxon><id>9.4.4.1</id><entry>Joint</entry></taxon>
        <taxon><id>9.4.4.2</id><entry>Conditional</entry></taxon>
        <taxon><id>9.4.4.3</id><entry>Expectations</entry></taxon>
      </taxon>
      <taxon>
        <id>9.4.5</id><entry>Stochastic Processes</entry>
        <taxon><id>9.4.5.1</id><entry>Brownian Motion</entry></taxon>
        <taxon><id>9.4.5.2</id><entry>Markov Chains</entry></taxon>
        <taxon><id>9.4.5.3</id><entry>Queuing Theory</entry></taxon>
      </taxon>
      <taxon><id>9.4.6</id><entry>Probability Measures</entry></taxon>
      <taxon><id>9.4.7</id><entry>Simulation</entry></taxon>
    </taxon>
  </taxon>
  <taxon>
    <id>10</id><entry>Applied Mathematics</entry>
    <taxon><id>10.1</id><entry>Mathematical Physics</entry></taxon>
    <taxon><id>10.2</id><entry>Mathematical Economics</entry></taxon>
    <taxon><id>10.3</id><entry>Mathematical Biology</entry></taxon>
    <taxon><id>10.4</id><entry>Mathematics for Business</entry></taxon>
    <taxon><id>10.5</id><entry>Engineering Mathematics</entry></taxon>
    <taxon><id>10.6</id><entry>Mathematical Sociology</entry></taxon>
    <taxon><id>10.7</id><entry>Mathematics for Social Sciences</entry></taxon>
    <taxon><id>10.8</id><entry>Mathematics for Computer Science</entry></taxon>
    <taxon><id>10.9</id><entry>Mathematics for Humanities</entry></taxon>
    <taxon><id>10.10</id><entry>Consumer Mathematics</entry></taxon>
  </taxon>
  <taxon>
    <id>11</id><entry>Mathematics History</entry>
    <taxon><id>11.1</id><entry>General</entry></taxon>
    <taxon><id>11.2</id><entry>Famous Problems</entry></taxon>
    <taxon><id>11.3</id><entry>Biographies of Mathematicians</entry></taxon>
  </taxon>
</taxonomy>