# New in *MathWorld* -- September
2005

### Friday September 30, 2005

- Confluent Hypergeometric Function of the Second Kind (modified)
- Constructible Polygon (modified)
- Euler Square (modified)
- Padovan Sequence (modified)
- Perrin Sequence (modified)
- Plastic Constant (modified)
- Plastic Number
- Sierpiński Sieve (modified)
- Silver Number

### Thursday September 29, 2005

- Central Trinomial Coefficient (modified)

### Wednesday September 28, 2005

- Inflection Point (modified)
- Polynomial Discriminant (modified)

### Friday September 23, 2005

- Archimedean Circle
- BBP-Type Formula (modified)
- Beetle Problem
- Eisenstein Series (modified)
- Pappus Chain (modified)
- Resolvent Cubic
- Schoch Line
- Woo Circle

### Thursday September 22, 2005

- Brocard Points (modified)
- Dodecagon (modified)
- Eccentric Angle (modified)
- Eisenstein's Irreducibility Criterion (modified)
- Hermitian Operator (modified)
- Injection (modified)
- Parallelizable (modified)

### Wednesday September 21, 2005

- Bernoulli Number (modified)
- Composition (modified)
- Kernel
- Lehmer Cotangent Expansion (modified)
- Nullity (modified)
- Parallelizable (modified)
- Pierce Expansion
- Rank-Nullity Theorem
- Sparkline

### Tuesday September 20, 2005

- Injection (modified)
- Ker (modified)
- Prime Array (modified)
- Solid Angle (modified)

### Monday September 19, 2005

- Catalan's Conjecture (modified)
- Covariance (modified)
- Cunningham Chain (modified)
- Lehmer Cotangent Expansion
- Lehmer's Constant (modified)
- Partial Recursive Function
- Polylogarithm (modified)
- Prime Array (modified)
- Primitive Recursive Function (modified)
- Recursive Function
- Total Recursive Function

### Friday September 16, 2005

- Cube 3-Compound (modified)
- Cunningham Chain (modified)
- Derivative (modified)
- Frequency Representation
- Game of Hex (modified)
- Geodesic Dome (modified)
- Hirschhorn 3-7-5 Identity
- Hurwitz's Formula (modified)
- Hurwitz's Theorem
- Jordan Measure (modified)
- K-Means Clustering Algorithm (modified)
- Lagrange Interpolating Polynomial (modified)
- Partition (modified)
- Prime Gaps (modified)
- Ramanujan 6-10-8 Identity (modified)
- Ramification Index
- Random Matrix (modified)
- Riemann-Hurwitz Formula
- Star of Lakshmi (modified)
- Zermelo-Fraenkel Axioms (modified)

### Thursday September 15, 2005

- Antisquare Number (modified)
- Bôcher Prize
- Bootstrap Methods (modified)
- Colossally Abundant Number
- Genesa
- Gudermannian (modified)
- Isocline (modified)
- Jacobi Theta Functions (modified)
- Legendre-Gauss Quadrature (modified)
- Merkaba
- Metamathematics (modified)
- Palindromic Prime (modified)
- Power (modified)
- Prime Arithmetic Progression (modified)
- Proof Theory (modified)
- Stella Octangula (modified)

### Wednesday September 14, 2005

- Bernoulli Number (modified)
- Cramér-Granville Conjecture
- Far Greater
- Far Less
- Four-Color Theorem (modified)
- Honaker's Problem
- Linear Recurrence Equation (modified)
- Mills' Constant (modified)
- Mills' Prime
- Mills' Theorem
- Much Greater (modified)
- Thomsen's Figure (modified)
- Toroidal Field (modified)

### Tuesday September 13, 2005

- Contact Triangle (modified)
- Coversine (modified)
- Exsecant (modified)
- Fuhrmann Triangle (modified)
- Graph (modified)
- Haversine (modified)
- Incidence Graph
- Levi Graph
- Local Extremum (modified)
- Local Maximum (modified)
- Local Minimum (modified)
- Relative Extremum (modified)
- Relative Maximum (modified)
- Relative Minimum (modified)
- Scalene Triangle (modified)
- Thomsen's Figure (modified)
- Tutte 8-Cage (modified)
- Versine (modified)

### Monday September 12, 2005

- Axis (modified)
- Bloch Constant (modified)
- Derivative (modified)
- First Derivative
- Fuhrmann Triangle (modified)
- Lebesgue Integrable (modified)
- Negative Part (modified)
- Pareto Distribution (modified)
- Positive Part (modified)
- Random Matrix (modified)
- Taylor Series (modified)
- Thomsen's Figure (modified)
- Triangular Cupola (modified)
- Tridiminished Icosahedron (modified)
- Trilinear Coordinates (modified)
- Tucker Hexagon (modified)

### Friday September 9, 2005

- Astroidal Ellipsoid (modified)
- Dirichlet Generating Function (modified)
- Line Graph (modified)
- Total Derivative
- Triangle Centroid (modified)

### Thursday September 8, 2005

- Astroidal Ellipsoid (modified)
- Hyperbolic Octahedron (modified)
- Le Cam's Inequality (modified)
- Levy's Conjecture (modified)
- Prime Array (modified)
- Taylor's Theorem (modified)

### Tuesday September 6, 2005

- Airy Functions (modified)
- Cauchy-Frobenius Lemma (modified)
- Jordan Block (modified)
- Jordan Canonical Form (modified)
- Nanpure
- Number Place
- Orbit-Counting Theorem
- Orthic Triangle (modified)
- Real Projective Plane (modified)
- Sudoku (modified)

### Friday September 2, 2005

- Busemann-Petty Problem (modified)
- Hough Transform (modified)
- Ito's Lemma (modified)
- Itô's Theorem (modified)
- Kreisel Conjecture (modified)
- Osculating Circle (modified)
- Problem (modified)
- Q (modified)
- Q.E.F. (modified)
- Rational Number (modified)
- SOHCAHTOA (modified)
- Theorem (modified)
- Z (modified)

### Thursday September 1, 2005

- Bertrand's Postulate (modified)
- Latin Square (modified)
- Ramanujan Prime
- Sudoku (modified)

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