# New in *MathWorld* -- September
2002

### Monday September 30, 2002

- Perfect Square Dissection (modified)

### Sunday September 29, 2002

- Antiprism Graph
- Pentahedron (modified)
- Trilinear Line (modified)

### Saturday September 28, 2002

- Graph Composition (modified)
- Graph Lexicographic Product (modified)
- Graph Power (modified)
- Graph Product (modified)
- Nested Polygon
- Polygon Circumscribing
- Prism (modified)
- Prism Graph

### Friday September 27, 2002

- Chu-Vandermonde Identity (modified)
- Mrs. Perkins's Quilt (modified)
- Planar Graph (modified)

### Thursday September 26, 2002

- Icosahedral Equation (modified)
- Nevanlinna Prize
- Penrose Tiles (modified)
- Three-Colorable Map (modified)

### Wednesday September 25, 2002

- Hexahedron (modified)

### Tuesday September 24, 2002

- Icosahedral Equation (modified)
- Small Rhombicosidodecahedral Graph (modified)
- Stereographic Projection (modified)

### Monday September 23, 2002

- Connected Graph (modified)
- Cuboctahedral Graph (modified)
- Cyclic Tag System (modified)
- Heawood Graph (modified)
- Petersen Graph (modified)
- Polyhedral Graph (modified)
- Universal Cellular Automaton
- Universality
- Universal Turing Machine (modified)

### Sunday September 22, 2002

- Complexity Theory (modified)
- Graph Isomorphism Complete
- Inverse Secant (modified)
- Isomorphic Graphs (modified)

### Saturday September 21, 2002

- Circulant Graph (modified)
- Complete Bipartite Graph (modified)
- Cubic Graph (modified)
- Quintic Graph (modified)
- Utility Graph (modified)

### Friday September 20, 2002

- Hexahedral Graph (modified)
- Pentahedral Graph (modified)
- Polyhedral Graph (modified)
- Pyramid (modified)
- Self-Dual Graph (modified)
- Self-Dual Polyhedron (modified)

### Thursday September 19, 2002

- Arc-Transitive Graph
- Box-and-Whisker Plot (modified)
- Cuboctahedral Graph
- Degree Sequence (modified)
- Doyle Graph
- Heptahedron (modified)
- Hexahedron (modified)
- Icosidodecahedral Graph
- Octahedral Graph (modified)
- Octahedron (modified)
- Pareto Plot
- Pentahedron (modified)
- Quantile-Quantile Plot
- Quartic Graph (modified)
- Quartic Symmetric Graph
- Small Rhombicosidodecahedral Graph
- Small Rhombicuboctahedral Graph
- Solitary Number (modified)
- Symmetric Graph (modified)
- Tetrahedron (modified)
- Three-Colorable Map

### Wednesday September 18, 2002

- Church-Turing Thesis (modified)
- Foster Graph (modified)
- Friendly Number
- Friendly Pair (modified)
- Inverse Cosecant (modified)
- Inverse Cotangent (modified)
- Inverse Tangent (modified)
- Sextic Equation (modified)
- Znám's Problem (modified)

### Tuesday September 17, 2002

- Bellman-Ford Algorithm
- Dijkstra's Algorithm (modified)
- Interprime
- Inverse Cosine (modified)
- Lights Out Puzzle (modified)
- Linear Regression (modified)
- Reaching Algorithm
- Shortest Path Problem
- Transcendental Element
- Transcendental Extension
- Trivial Module
- Trivial Ring

### Monday September 16, 2002

- Free Idempotent Monoid
- Icosahedral Graph (modified)
- Least Squares Fitting (modified)
- Least Squares Fitting--Perpendicular Offsets (modified)
- Monoid (modified)
- Proper Subvariety
- Schubert Variety
- Subvariety

### Sunday September 15, 2002

### Friday September 13, 2002

- Busy Beaver (modified)
- Dodecahedral Graph (modified)
- Dots and Boxes (modified)
- Icosahedral Graph (modified)
- Lights Out Puzzle (modified)
- Octahedral Graph (modified)
- Slinky
- Tetrahedral Graph (modified)
- Turmite (modified)

### Thursday September 12, 2002

- Commutative Monoid (modified)
- Cyclic Tag System (modified)
- Dots and Boxes
- Epsilon-Delta Definition
- Epsilon-Delta Proof
- Finite Set
- Grassmannian (modified)
- Homology Cycle
- Left Ideal
- Lights Out Puzzle
- Monoid (modified)
- Right Ideal
- Rotation (modified)
- Rule 30
- Rule 90
- Submonoid
- Vector Space Flag

### Wednesday September 11, 2002

### Tuesday September 10, 2002

- Busy Beaver (modified)
- Turing Machine (modified)

### Monday September 9, 2002

- Coxeter Graph (modified)
- Cubic Symmetric Graph (modified)
- Series Reversion (modified)

### Friday September 6, 2002

- Confluent
- Connected Graph (modified)
- Indefinite Integral (modified)
- Langton's Ant (modified)
- Symmetric Graph (modified)
- Turmite

### Wednesday September 4, 2002

- Indefinite Integral (modified)
- Integral (modified)
- Polar Angle (modified)
- Polar Coordinates (modified)

### Tuesday September 3, 2002

- Folkman Graph (modified)
- Integral Equation (modified)
- Projection Matrix (modified)
- String Rewriting System
- Symmetric Graph (modified)
- Vertex-Transitive Graph (modified)

### Monday September 2, 2002

- Alternating Group (modified)
- Biggs-Smith Graph
- Complete Graph (modified)
- Cubic Symmetric Graph
- Desargues Graph
- Distance-Regular Graph (modified)
- Edge Automorphism
- Edge Automorphism Group
- Edge-Transitive Graph (modified)
- Foster Graph
- Group Orbit (modified)
- Pappus Graph
- Permutation Group (modified)
- Plane (modified)
- Stabilizer
- Symmetric Group (modified)
- Transitive Group (modified)
- Unitransitive Graph (modified)
- Vertex-Transitive Graph (modified)

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