# New in *MathWorld* -- January
2007

### Wednesday January 31, 2007

- Cocktail Party Graph (modified)

### Monday January 29, 2007

- Integer Sequence Primes (modified)
- NSW Number (modified)
- Pell Number (modified)

### Thursday January 25, 2007

- Definite Integral (modified)
- Derivative (modified)
- FoxTrot Series (modified)
- Limit (modified)

### Wednesday January 24, 2007

- Airy Functions (modified)
- Airy Function Zeros

### Tuesday January 23, 2007

- Bessel Function Zeros (modified)
- Catalan Number (modified)
- Derangement Number
- Riemann Zeta Function Zeros (modified)
- Subfactorial (modified)

### Monday January 22, 2007

- 2 (modified)
- Peacock Tail (modified)
- Spikey (modified)

### Sunday January 21, 2007

- Divisibility Tests (modified)

### Saturday January 20, 2007

- Appell Hypergeometric Function (modified)
- Peacock Tail (modified)
- q-Pi (modified)

### Friday January 19, 2007

- Lommel Polynomial (modified)
- Spikey (modified)
- Wallis Formula (modified)

### Monday January 15, 2007

- Spikey (modified)
- Spiky (modified)
- Twin Primes (modified)

### Sunday January 14, 2007

- Derivative (modified)
- Factor (modified)
- Factorization (modified)
- Limit (modified)

### Friday January 12, 2007

- Frobenius Number (modified)

### Thursday January 11, 2007

- Left Factorial (modified)
- Peg (modified)
- Tilde (modified)
- Triangular Number (modified)

### Tuesday January 9, 2007

- Yff Conjecture (modified)

### Monday January 8, 2007

- Flanders' Inequality (modified)
- FoxTrot Series
- Fraction (modified)

### Sunday January 7, 2007

- Binomial Coefficient (modified)
- Definite Integral (modified)
- Deletable Prime
- Digamma Function (modified)
- Harmonic Number (modified)
- Irrationality Measure (modified)
- Jonquière's Function (modified)
- Jonquière's Relation
- Jonquière's Theorem (modified)
- Jonquière's Transformation (modified)
- Necker Cube (modified)
- Thue-Morse Sequence (modified)
- Yff's Inequality

### Friday January 5, 2007

- Ciphertext (modified)
- Dürer's Magic Square (modified)
- Homogeneous Ordinary Differential Equation (modified)
- ISBN (modified)
- Korteweg-de Vries-Burgers Equation (modified)
- Pseudosphere (modified)

### Wednesday January 3, 2007

- Absorption Identity
- Clawson Point (modified)
- de Longchamps Point (modified)
- Factorial Prime (modified)
- Feuerbach Point (modified)
- Geometric Congruence (modified)
- Gergonne Point (modified)
- ISBN (modified)
- Line-Line Intersection (modified)
- Mittenpunkt (modified)
- Nagel Point (modified)
- Nine-Point Center (modified)
- Orthocenter (modified)
- Spieker Center (modified)
- Symmedian Point (modified)

### Tuesday January 2, 2007

- Great Stellated Dodecahedron (modified)
- Kepler-Poinsot Polyhedron (modified)
- Kepler-Poinsot Solid (modified)
- Khinchin's Constant (modified)
- Modular Inverse (modified)
- Round Number (modified)
- Small Stellated Dodecahedron (modified)
- Stella Octangula (modified)
- Triangle Centroid (modified)
- Triangular Number (modified)

### Monday January 1, 2007

- Cubic Triangular Number
- Incenter (modified)

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