# New in *MathWorld* -- April
2005

### Tuesday April 26, 2005

- Boundedly Compact Space (modified)

### Friday April 22, 2005

- Faà di Bruno's Formula (modified)
- Hopf Algebra (modified)
- Newton's Forward Difference Formula (modified)
- Tanhc Function
- Waring's Problem (modified)

### Thursday April 21, 2005

- Abel-Ruffini Theorem
- Additive Function
- Additive Functor
- Algebra of Random Variables
- Algorithmics
- Almost Surely
- Andreini Tessellation
- Angle Excess
- Anyon
- Arcminute
- Arcsecond
- Diagonal Matrix (modified)
- Edge Contraction
- Edge Splitting
- Graph Minor (modified)
- Jiang Zemin's Problem
- Miquel's Pentagram Theorem
- Mortgage
- Tutte's Wheel Theorem
- Waring's Problem (modified)

### Wednesday April 20, 2005

- Hopf Algebra
- Newton's Iteration (modified)
- Newton's Method (modified)
- Resistance Distance

### Tuesday April 19, 2005

- Christmas Stocking Theorem
- Four-Color Theorem (modified)
- Hockey Stick Theorem
- Metacyclic Group (modified)
- Rogers Mod 14 Identities
- Rogers-Ramanujan Identities (modified)
- Star of David Theorem (modified)
- van Aubel Line (modified)

### Monday April 18, 2005

- Almost Integer (modified)
- Cauchy Functional Equation
- Interior Point Method (modified)
- Lambert W-Function (modified)
- Minesweeper (modified)
- No-Three-in-a-Line-Problem (modified)

### Sunday April 17, 2005

- Alternating Factorial (modified)
- Integer Sequence Primes (modified)
- Keller's Conjecture (modified)
- Look and Say Sequence (modified)
- One and Only One

### Saturday April 16, 2005

- Integer Lattice (modified)
- Inverse Problem
- No-Three-in-a-Line-Problem
- Power Tower (modified)
- Recurrence Plot (modified)

### Friday April 15, 2005

- Borsuk's Conjecture (modified)
- Chevalley Groups (modified)
- Circumcevian Triangle (modified)
- Feit-Thompson Theorem (modified)
- Lerch Transcendent (modified)
- M'Cay Cubic (modified)
- Nyquist Frequency (modified)
- Nyquist Limit
- Quadratic Nonresidue
- Quadratic Residue (modified)
- Relative Entropy (modified)
- Rogers-Ramanujan Identities (modified)
- Second-Order Eulerian Triangle
- Solvable Group (modified)
- Thomson Cubic (modified)
- Twisted Chevalley Groups (modified)

### Thursday April 14, 2005

- Eulerian Path (modified)
- Eulerian Trail (modified)

### Tuesday April 12, 2005

- Derivative (modified)
- Integral (modified)

### Thursday April 7, 2005

- Dom
- Indefinite Integral (modified)

### Wednesday April 6, 2005

- Bernoulli Number (modified)
- Nested Radical Constant

### Tuesday April 5, 2005

- Central Binomial Coefficient (modified)
- Deltahedron (modified)
- Lambert W-Function (modified)
- Paris Constant
- Pentagonal Deltohedron (modified)
- Pentagonal Trapezohedron
- Simpson's Rule (modified)

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