# New in *MathWorld* -- October
2005

### Monday October 31, 2005

- Additive Group (modified)
- König-Egeváry Theorem (modified)
- Square Packing (modified)
- Triangle Area (modified)
- Zeta Distribution
- Zipf Distribution

### Sunday October 30, 2005

- Integer Sequence Primes (modified)
- Pierpont Prime (modified)

### Saturday October 29, 2005

- Integer Sequence Primes (modified)
- Pierpont Prime

### Friday October 28, 2005

- 257-gon (modified)
- 65537-gon (modified)
- Integer Sequence Primes (modified)
- Palindromic Prime (modified)
- Thâbit ibn Kurrah Number (modified)

### Thursday October 27, 2005

- Constructible Polygon (modified)
- Heptadecagon (modified)
- Hofstadter-Conway $10,000 Sequence (modified)
- Newman-Conway Sequence (modified)
- Rounded Rectangle (modified)
- Trigonometry Angles (modified)

### Wednesday October 26, 2005

- Polynomial Factorization (modified)
- Power (modified)
- Ramsey Number (modified)
- Sine (modified)
- Spherical Coordinates (modified)
- Successive Square Method
- Zero (modified)

### Tuesday October 25, 2005

- Additive Inverse (modified)
- Anticomplement (modified)
- Antiorthic Axis (modified)
- Circumcircle (modified)
- Complement (modified)
- Conway Triangle Notation (modified)
- de Longchamps Circle (modified)
- de Longchamps Line (modified)
- de Longchamps Point (modified)
- GEOS Circle (modified)
- Nine-Point Circle (modified)
- Polar Circle (modified)
- Rotation Group (modified)
- Rounded Rectangle
- Triangle (modified)
- Trilinear Polar (modified)
- Trilinear Pole (modified)
- Trott Constants (modified)

### Monday October 24, 2005

- Caesar's Method
- Central Circle (modified)
- Cipher
- Ciphertext
- Counterexample
- Dt
- GEOS Circle (modified)
- Numerical Stability
- Ring (modified)
- Total Derivative (modified)

### Saturday October 22, 2005

- Christoffel Symbol of the Second Kind (modified)
- Cylindrical Coordinates (modified)
- Random Matrix (modified)
- Spherical Coordinates (modified)

### Friday October 21, 2005

- Antiorthic Axis (modified)
- Christoffel Symbol of the Second Kind (modified)
- Coaxal Circles (modified)
- Coaxal System (modified)
- de Longchamps Line (modified)
- GEOS Circle (modified)
- Gergonne Line (modified)
- Lemoine Axis (modified)
- Lester Circle (modified)
- Lucas Circles Radical Circle (modified)
- Lucas Inner Circle (modified)
- Nagel Line (modified)
- Orthogonal Circles (modified)
- Orthoptic Circle of the Steiner Inellipse (modified)
- Parry Circle (modified)
- Polar Circle (modified)
- Radical Line (modified)
- Soddy Line (modified)
- Sophie Germain Prime (modified)
- Spherical Coordinates (modified)
- Spherical Polar Coordinates
- Stevanović Circle (modified)
- Taxicab Number (modified)

### Thursday October 20, 2005

- Capsule (modified)
- Central Circle (modified)
- Fibonacci Number (modified)
- Gaussian Elimination (modified)
- Kobon Triangle (modified)
- Orthic Axis (modified)
- Orthoptic Circle of the Steiner Inellipse
- Perrin Sequence (modified)
- Reduced Echelon Form
- Ring (modified)
- Row Echelon Form
- RowReduce
- Row-Reduced Echelon Form
- Stadium
- Stadium Billiards

### Wednesday October 19, 2005

- Addition-Multiplication Magic Square (modified)
- Clausen's Integral (modified)
- Elliptic Cylindrical Coordinates (modified)

### Tuesday October 18, 2005

- Bell Polynomial (modified)
- Beta Binomial Distribution (modified)
- Elliptic Cylindrical Coordinates (modified)
- Exponential Polynomial (modified)

### Monday October 17, 2005

- Babylonian Numerals
- BCH Code
- Bean Machine
- Bezigon
- Binary Golay Code
- Black Model
- Blivet
- Bravais Lattice
- Bresenham's Line Algorithm
- First Group Isomorphism Theorem (modified)
- Isohedral Tiling (modified)
- Nondeterministic Turing Machine
- NP-Problem (modified)
- Second Group Isomorphism Theorem (modified)
- Third Group Isomorphism Theorem (modified)

### Friday October 14, 2005

- Box Fractal (modified)
- Central Circle (modified)
- GEOS Circle
- Lindenmayer System (modified)
- Mantissa (modified)
- Permutation Matrix (modified)
- Pi Digits (modified)
- Riemann Zeta Function Zeros (modified)
- Sphere Packing (modified)
- Unsolved Problems (modified)

### Thursday October 13, 2005

- Bell Polynomial (modified)
- Central Line (modified)
- de Longchamps Line (modified)
- Euler Line (modified)
- Meijer G-Function (modified)
- Orthic Axis (modified)
- Sinc Function (modified)
- Spherical Hankel Function of the First Kind (modified)
- Spherical Hankel Function of the Second Kind (modified)
- SphericalHankelH1
- SphericalHankelH2

### Wednesday October 12, 2005

- Fibonacci Prime (modified)
- Integer Sequence Primes (modified)
- Linear Programming (modified)
- Near-Square Prime (modified)

### Tuesday October 11, 2005

- Beta Binomial Distribution
- Cauchy Distribution (modified)
- Exponential Distribution (modified)
- Extreme Value Distribution (modified)
- Gamma Distribution (modified)
- Half-Normal Distribution (modified)
- HalfNormalDistribution
- Inverse Gaussian Distribution
- Laplace Distribution (modified)
- Log Normal Distribution (modified)
- NoncentralChiSquareDistribution
- NoncentralFRatioDistribution
- Pareto Distribution (modified)
- Rayleigh Distribution (modified)
- Wald Distribution

### Monday October 10, 2005

- Bell Number (modified)
- Bernoulli Number (modified)
- Complete Elliptic Integral of the First Kind (modified)
- Complete Elliptic Integral of the Second Kind (modified)
- Continued Fraction (modified)
- Convergent (modified)
- Convergent Sequence (modified)
- Convergent Series (modified)
- Differential Operator (modified)
- Even Permutation
- Indicial Equation (modified)
- Integer Sequence Primes (modified)
- Lagrange's Identity (modified)
- Laguerre Differential Equation (modified)
- Odd Permutation
- Parabolic Cylinder Function (modified)
- Regular Borel Measure
- SpheroidalEigenvalue (modified)
- SpheroidalPS (modified)
- SpheroidalPSPrime (modified)
- SpheroidalQS (modified)
- SpheroidalQSPrime (modified)
- SpheroidalS1 (modified)
- SpheroidalS1Prime (modified)
- SpheroidalS2 (modified)
- SpheroidalS2Prime (modified)
- Spheroidal Wave Function (modified)
- Stirling Number of the Second Kind (modified)
- Vector Quadruple Product (modified)
- Whittaker Function (modified)

### Friday October 7, 2005

- Fibonacci Number (modified)

### Thursday October 6, 2005

- Orthic Axis (modified)
- Sabermetrics (modified)
- SOHCAHTOA (modified)
- Statistics (modified)

### Wednesday October 5, 2005

- Stewart's Theorem (modified)

### Tuesday October 4, 2005

- Abelian Semigroup (modified)
- Kobon Triangle (modified)
- Plastic Constant (modified)
- Polynomial Discriminant (modified)
- Triangular Distribution (modified)

### Monday October 3, 2005

- Fox H-Function (modified)

### Sunday October 2, 2005

- Integer Sequence Primes (modified)
- Jonquière's Function
- Padovan Sequence (modified)
- Perrin Sequence (modified)

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