# New in *MathWorld* -- September
2007

### Sunday September 30, 2007

- Catalan's Constant (modified)
- Figure Eight Knot (modified)
- Gamow-Stern Elevator Problem
- Hanning Function (modified)
- Welch Apodization Function (modified)

### Saturday September 29, 2007

- Clausen's Integral (modified)
- Hexagonal Number (modified)
- Integer Sequence Primes (modified)
- Lucas Correspondence Theorem (modified)
- Pentagonal Number (modified)
- Repunit (modified)
- Riemann Zeta Function zeta(2) (modified)
- Set-Covering Deployment
- Set Covering Deployment (modified)
- Sierpiński Sieve (modified)
- Spirograph (modified)
- Sudoku (modified)
- Thâbit ibn Kurrah Number (modified)
- Wolstenholme Number (modified)
- Wolstenholme's Theorem (modified)

### Friday September 28, 2007

- Almost Integer (modified)
- BarnesG
- Digamma Function (modified)
- Dirichlet Beta Function (modified)
- Euler-Mascheroni Constant (modified)
- Falling Factorial (modified)
- Fermat Prime (modified)
- Full Reptend Prime (modified)
- Fuzzy Logic (modified)
- Gröbner Basis (modified)
- Harmonic Number (modified)
- Jinc Function (modified)
- Linear Programming (modified)
- Minimax Theorem (modified)
- Partition Function P Congruences (modified)
- Pentagrammic Concave Deltohedron (modified)
- Pentagrammic Concave Trapezohedron
- Pentagrammic Deltohedron (modified)
- Pseudosphere (modified)
- Riemann Zeta Function (modified)
- Riemann Zeta Function zeta(3)
- Sinc Function (modified)
- Sine Integral (modified)
- Sinhc Function (modified)
- Tanc Function (modified)
- Tanhc Function (modified)
- Tractricoid (modified)
- Tractroid (modified)

### Thursday September 27, 2007

- Apéry's Constant (modified)
- Binomial Sums (modified)
- Catalan's Constant (modified)
- Combinatorial Geometry
- Fixed Point (modified)
- Illumination Problem (modified)
- Pi Formulas (modified)
- Sufficiently Large (modified)
- Uniform Polyhedron (modified)

### Wednesday September 26, 2007

- Almost Integer (modified)
- Cosine (modified)
- Dottie Number
- Planck's Radiation Function (modified)

### Sunday September 23, 2007

- Cofactor (modified)
- Sphere-Sphere Intersection (modified)

### Saturday September 22, 2007

- Chi (modified)
- Hyperbolic Cotangent (modified)
- Inverse Erf (modified)
- Kepler's Equation (modified)
- Laplace Limit (modified)
- Lens (modified)
- Normal Distribution Function (modified)
- Odd Function (modified)
- Standard Normal Distribution (modified)

### Friday September 21, 2007

- Goat Problem (modified)

### Thursday September 20, 2007

- Barnes G-Function (modified)
- Chió Pivotal Condensation (modified)
- Factorial Power (modified)
- Hyperfactorial (modified)
- K-Function (modified)
- Sylvester's Determinant Identity (modified)

### Wednesday September 19, 2007

- Keith Number (modified)
- Mertens Conjecture (modified)

### Tuesday September 18, 2007

- Illumination Problem (modified)
- Integer Programming
- Linear Programming (modified)
- Set Covering Deployment

### Monday September 17, 2007

- Frustum (modified)
- Heaviside Step Function (modified)
- Polynomial (modified)
- Polynomial Roots (modified)

### Sunday September 16, 2007

- Algebraic Number (modified)
- Bidiakis Cube (modified)

### Saturday September 8, 2007

- Disk Covering Problem (modified)

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