# New in *MathWorld* -- February
2004

### Sunday February 29, 2004

- Baillie-PSW Primality Test
- Complex Infinity (modified)
- Explicit Formula
- First Morley Triangle (modified)
- Indeterminate (modified)
- Mangoldt Function (modified)
- Newton's Iteration (modified)
- Pythagoras's Constant (modified)
- Rabin-Miller Strong Pseudoprime Test (modified)
- Square Root (modified)
- Square Root Inequality (modified)
- Strong Pseudoprime (modified)
- Wald's Equation (modified)
- Wolfram's Iteration

### Saturday February 28, 2004

- Fermat's Little Theorem (modified)

### Friday February 27, 2004

- Archimedean Solid (modified)
- Distinct Prime Factors (modified)
- Near-Square Prime (modified)
- Rule 30 (modified)

### Thursday February 26, 2004

- Compact Set (modified)
- Egorov's Theorem
- Palindrome
- Palindromic Number (modified)
- Palindromic Prime (modified)
- Platonic Solid (modified)
- Smarandache Function (modified)

### Wednesday February 25, 2004

- Baranyai's Theorem
- Inverse Tangent (modified)
- Max-Flow, Mincut Theorem
- Near-Square Prime (modified)
- Smarandache Function (modified)

### Tuesday February 24, 2004

- Bernoulli Number (modified)
- Eisenstein Integer (modified)
- Eisenstein Prime (modified)
- Graham's Number (modified)
- Hénon-Heiles Equation (modified)
- Imaginary Quadratic Field (modified)
- k-ary Divisor (modified)
- Prime Gaps (modified)
- Quaternion (modified)
- Qubic (modified)
- Riesel Number (modified)
- Second-Order Ordinary Differential Equation Second Solution (modified)
- Unit (modified)

### Monday February 23, 2004

- Composition (modified)
- Divisor Function (modified)
- Hypotraceable Graph (modified)
- Ore Graph (modified)
- Spherical Polyhedron (modified)
- Thomassen Graphs (modified)
- Tower of Hanoi (modified)
- Union-Closed Sets Conjecture (modified)
- Unitary Divisor Function (modified)

### Sunday February 22, 2004

- Bernoulli Number (modified)
- Go-Moku
- Gomoku
- Hypergeometric Function (modified)
- Naughts and Crosses
- Numerical Differentiation (modified)
- Qubic
- Rule 30 (modified)
- Second-Order Ordinary Differential Equation (modified)
- Second-Order Ordinary Differential Equation Second Solution (modified)
- Six Circles Theorem (modified)
- Square Root (modified)
- Tic-Tac-Toe (modified)
- Variance (modified)
- Walsh Function (modified)

### Saturday February 21, 2004

- Einstein Field Equations (modified)
- Pancake Sorting (modified)
- Zero (modified)

### Friday February 20, 2004

- Almost Integer (modified)
- Corkscrew Surface (modified)
- Cylinder (modified)
- Euler Characteristic (modified)
- Möbius Strip (modified)
- Near-Square Prime (modified)
- Nowhere Dense (modified)
- Prime Gaps (modified)
- Projective Plane (modified)
- Random Close Packing (modified)
- Sphere Packing (modified)
- Surface with Boundary (modified)
- Trigonometric Power Formulas (modified)
- Twisted Cylinder
- Twisted Sphere (modified)

### Thursday February 19, 2004

- Lambert Conformal Conic Projection (modified)
- Map Projection (modified)
- Miller Cylindrical Projection (modified)
- Polyconic Projection (modified)
- Random Permutation (modified)
- Smarandache Function (modified)
- van der Grinten Projection (modified)
- Vertical Perspective Projection (modified)

### Wednesday February 18, 2004

- Binary Tree (modified)
- Cassini Projection (modified)
- Eckert IV Projection (modified)
- Eckert VI Projection (modified)
- Gnomonic Projection (modified)
- Hamilton Circuit
- Hamilton Cycle
- Hamilton Graph
- Hamiltonian Cycle (modified)
- Hamiltonian Graph (modified)
- Hamiltonian Path (modified)
- Hamilton Path
- Hammer-Aitoff Equal-Area Projection (modified)
- Hammer Projection
- Lambert Azimuthal Equal-Area Projection (modified)
- Mercator Projection (modified)
- Miller Equidistant Projection (modified)
- Mollweide Projection (modified)
- Orthographic Projection (modified)
- Prime Difference Function (modified)
- Prime Gaps (modified)
- Prime Knot (modified)
- Sinusoidal Projection (modified)
- Stereographic Projection (modified)
- Trivalent Tree

### Tuesday February 17, 2004

- Consecutive Number Sequences (modified)
- Hurwitz Zeta Function (modified)
- Rational Amicable Pair (modified)

### Monday February 16, 2004

- Cylindrical Equal-Area Projection (modified)
- Gall Orthographic Projection (modified)
- Lambert Cylindrical Equal-Area Projection (modified)
- Peters Projection (modified)
- Rational Amicable Pair (modified)
- Tristan Edwards Projection (modified)

### Sunday February 15, 2004

- Albers Equal-Area Conic Projection (modified)
- Asterisk (modified)
- Balthasart Projection (modified)
- Behrmann Cylindrical Equal-Area Projection (modified)
- Bonne Projection (modified)
- Caret (modified)
- Cut Elimination Theorem
- Equirectangular Projection (modified)
- Exponent (modified)
- Exponentiation
- Fields Medal (modified)
- Power (modified)
- Racah W-Coefficient (modified)
- Rational Amicable Pair (modified)
- Times (modified)
- Wigner 9j-Symbol (modified)
- Wigner Coefficient

### Saturday February 14, 2004

- Heart Curve (modified)
- Heart Surface (modified)
- Lemniscate (modified)
- Prime Gaps (modified)
- Triangular Inequalities
- Wigner 3j-Symbol (modified)
- Wigner 6j-Symbol (modified)

### Friday February 13, 2004

- Antiderivative (modified)
- Bell Number (modified)
- Constant (modified)
- Constant of Integration
- Einstein Field Equations (modified)

### Thursday February 12, 2004

- Bloch Sphere
- Bloch Vector
- Magic Hexagram (modified)
- Triangle Coefficient (modified)

### Wednesday February 11, 2004

- Apéry's Constant (modified)
- Discrete Log
- Irrationality Measure (modified)

### Tuesday February 10, 2004

- Bohemian Dome (modified)

### Monday February 9, 2004

- Cotangent (modified)
- Golden Ratio (modified)
- Gronwall's Theorem (modified)
- Hexagram (modified)
- Magic Hexagram
- Prime Number Theorem (modified)
- Ramanujan Continued Fractions (modified)
- Robin's Theorem (modified)
- Viviani's Curve (modified)
- Viviani's Window

### Sunday February 8, 2004

- Abstract Topological Space
- Andrica's Conjecture (modified)
- Binomial Number (modified)
- Brocard's Conjecture (modified)
- Cramér Conjecture (modified)
- Divisor Function (modified)
- Odd Divisor Function (modified)
- Prime Counting Function (modified)
- Prime Number Theorem (modified)
- Riemann-Siegel Formula
- Riemann Zeta Function Zeros (modified)
- Topological Space (modified)

### Saturday February 7, 2004

- Circle (modified)
- Elliptic Curve Factorization Method (modified)
- Taylor Series (modified)
- Variance (modified)

### Friday February 6, 2004

- Mock Theta Function (modified)
- Point-Point Distance--2-Dimensional (modified)
- Point-Point Distance--3-Dimensional (modified)

### Thursday February 5, 2004

- Adjoint Matrix (modified)
- Conjugate Transpose (modified)
- Point-Point Distance--2-Dimensional (modified)
- Point-Point Distance--3-Dimensional (modified)
- Sphere Point-Point Picking

### Wednesday February 4, 2004

- Normal Factor
- Pythagorean Quadruple (modified)

### Tuesday February 3, 2004

- Stirling's Series (modified)

### Sunday February 1, 2004

- Cube 2-Compound (modified)
- Cube-Octahedron Compound (modified)
- Cuboctahedron (modified)
- Deltoidal Icositetrahedron (modified)
- Dodecahedron (modified)
- Elongated Square Dipyramid (modified)
- Exponential Integral (modified)
- Icosahedron (modified)
- Möbius Strip (modified)
- Motzkin Number (modified)
- Necker Cube (modified)
- Octahedron 3-Compound (modified)
- Penrose Stairway (modified)
- Pentagonal Dipyramid (modified)
- Rhombic Dodecahedron (modified)
- Schouten's Staircase
- Schroeder Stairs (modified)
- Small Rhombicuboctahedron (modified)
- Small Stellated Dodecahedron (modified)
- Small Triakis Octahedron (modified)
- Spherical Mirror
- Spherical Spiral (modified)
- Stella Octangula (modified)
- Tetrahedron 5-Compound (modified)
- Transcendental Function (modified)
- Trapezohedron (modified)
- Trefoil Knot (modified)
- Unitary Amicable Pair (modified)
- Unitary Divisor Function (modified)
- Wallace-Bolyai-Gerwien Theorem (modified)
- Watson's Identities (modified)
- Watson's Triple Integrals (modified)

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