# New in *MathWorld* -- February
2002

### Thursday February 28, 2002

- Board (modified)
- Checkerboard
- Chessboard (modified)
- Multi-Index Notation
- Pólya Enumeration Theorem (modified)
- Rep-Tile (modified)
- Schwartz Function (modified)
- Schwartz Space
- Star Number (modified)
- Symmetric Group (modified)

### Wednesday February 27, 2002

- Cycle Index
- Icosahedron (modified)
- Parabola (modified)
- Polygon (modified)
- Principle of Insufficient Reason (modified)
- Torus Cannibal (modified)
- Tournament (modified)

### Tuesday February 26, 2002

- Heaviside Step Function (modified)
- Pathological
- Rectangle Function (modified)
- Triangle Function (modified)

### Monday February 25, 2002

### Sunday February 24, 2002

- Shah Function (modified)

### Friday February 22, 2002

- Square Number (modified)

### Thursday February 21, 2002

### Tuesday February 19, 2002

- Isosceles Triangle (modified)
- Sigma-Compact Topological Space
- Sphere Point Picking (modified)

### Monday February 18, 2002

- Least Common Multiple (modified)
- Orthogonal Group (modified)
- Prime Number (modified)
- Smarandache Sequences (modified)
- Tetradic Number

### Sunday February 17, 2002

- Gray Graph (modified)

### Saturday February 16, 2002

- Gamma Function (modified)

### Thursday February 14, 2002

- 30-60-90 Triangle
- Eternity
- Polydrafter
- Trefoil Knot (modified)

### Wednesday February 13, 2002

- L^2-Norm (modified)
- Lorenz Attractor (modified)
- Simon's Problems
- Smale's Problems
- Square Triangle Picking (modified)

### Monday February 11, 2002

- Binary (modified)
- Bit (modified)
- Byte (modified)
- Crumb
- Nibble (modified)
- Nim-Value (modified)
- Tournament (modified)
- Tournament Matrix (modified)

### Sunday February 10, 2002

- Cubic Number (modified)
- Empty Set (modified)
- Octahedral Number (modified)
- Oriented Graph (modified)
- Score Sequence (modified)
- Square Wave (modified)

### Saturday February 9, 2002

- Absorption Law (modified)
- Bell Number (modified)
- Directed Graph (modified)
- Lattice (modified)
- Nonempty Set (modified)
- Pollock's Conjecture
- Tetrahedral Number (modified)
- Tournament (modified)

### Friday February 8, 2002

- Antiautomorphism (modified)
- Antihomomorphism
- Ball (modified)
- Byte (modified)
- Exabyte
- Exbibyte
- Gibibyte
- Gigabyte (modified)
- Heaviside Step Function (modified)
- Hypersphere (modified)
- Kibibyte
- Kilobyte (modified)
- Mebibyte
- Megabyte (modified)
- Pebibyte
- Petabyte
- Tebibyte

### Wednesday February 6, 2002

- Co-H-Space
- C^* (modified)
- Elliptic Geometry (modified)
- Fundamental Group (modified)
- Hermite Number (modified)
- Hermite Polynomial (modified)
- Hopf Invariant One Theorem
- H-Space (modified)
- Punctured Plane
- Triple Series

### Tuesday February 5, 2002

- Line-Line Intersection (modified)

### Monday February 4, 2002

- Cut (modified)
- Hundred-Dollar, Hundred-Digit Challenge Problems
- Maxcut
- Mincut (modified)
- Multichoose (modified)
- Multiset (modified)
- Woodall Number (modified)

### Saturday February 2, 2002

- Empty Set (modified)
- Logarithm (modified)
- Nonempty Set
- Tau Function (modified)

### Friday February 1, 2002

- Normal Distribution Function (modified)

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