# New in *MathWorld* -- September
2004

### Thursday September 30, 2004

- Antisymmetric Matrix (modified)
- Devil's Pitchfork
- Escher's Cube
- Freemish Crate (modified)
- GK-Regular (modified)
- Impossible Figure (modified)
- Impossible Fork
- Impossible Tribar
- InterpolatingPolynomial
- Lagrange Interpolating Polynomial (modified)
- Penrose Rectangle
- Penrose Square
- Penrose Triangle
- Shi (modified)
- Simpson's Rule (modified)
- Tri-Bar (modified)
- Tribar (modified)

### Wednesday September 29, 2004

### Tuesday September 28, 2004

- Catalan's Conjecture (modified)
- Conformal Mapping (modified)
- Congruence (modified)
- Cubic Number (modified)
- Fermat Quotient (modified)
- Hoffman-Singleton Graph (modified)
- Hyperboloid (modified)
- Isogonal Mapping
- Kirkman's Schoolgirl Problem (modified)
- New Kind of Science
- Retraction
- Stirling Number of the Second Kind (modified)

### Monday September 27, 2004

- Cosine Integral (modified)
- Cubic Number (modified)
- Gerschgorin Circle Theorem (modified)
- Gershgorin Circle Theorem (modified)
- Multigraph (modified)
- Retract
- Shortest-Path Spanning Tree
- Simple Graph (modified)
- Spanning Tree (modified)
- Structure

### Sunday September 26, 2004

- Blancmange Function (modified)
- Deformation Retract (modified)
- Heptadecagon (modified)
- Quaternion Group (modified)
- Weierstrass Function (modified)

### Friday September 24, 2004

- Matrix Norm (modified)

### Thursday September 23, 2004

- Allais Paradox (modified)
- Basepoint
- Catalan's Constant (modified)
- Cauchy-Riemann Equations (modified)
- Continuous Map
- Deformation Retract (modified)
- Dirichlet Beta Function (modified)
- Dirichlet Character
- Independence Axiom (modified)
- Loop (modified)
- Loop Space (modified)
- Mills Ratio (modified)
- Number Theoretic Character (modified)
- Path Space
- Pointed Map
- Pointed Space
- Scatter Diagram (modified)
- Scatterplot (modified)
- Semilocally 1-Connected
- Semilocally Simply Connected
- Strong Deformation Retract (modified)
- Triangular Orthobicupola (modified)
- Trivial Loop
- Turing Machine (modified)

### Wednesday September 22, 2004

- Angle Bracket (modified)
- Bra (modified)
- Deltahedron (modified)
- Fermat Prime (modified)
- Fredholm Integral Equation of the First Kind (modified)
- Green's Function (modified)
- Haar Function (modified)
- Hadamard's Maximum Determinant Problem (modified)
- Isohedron (modified)
- Ket (modified)
- Kimberling Sequence (modified)
- Outlier
- Sobolev Space
- Triangular Orthobicupola (modified)

### Tuesday September 21, 2004

- Analysis (modified)
- Base (modified)
- Complex Analysis (modified)
- Hypothesis (modified)
- Image
- Intermediate Value Theorem (modified)
- Law of Large Numbers
- Range (modified)
- Round Number (modified)
- Scatter Diagram
- Scatter Plot (modified)
- Separation of Variables (modified)
- Spiky (modified)
- Toroidal Polyhedron (modified)
- Triple Integral

### Monday September 20, 2004

- Binomial Series (modified)
- Frobenius Norm (modified)
- Paris-Harrington Theorem (modified)
- Spikey
- Spiky (modified)

### Friday September 17, 2004

- Almost Integer (modified)
- Base Field
- Fundamental Unit (modified)
- Genocchi Number (modified)
- GK-Regular
- Half-GCD
- Nearest Integer Continued Fraction
- Pentagonal Number (modified)
- Superior Highly Composite Number
- Validity

### Thursday September 16, 2004

### Wednesday September 15, 2004

- Aliquot Sequence (modified)
- Beast Number (modified)
- Constructible Function (modified)
- e Approximations (modified)
- Euler-Mascheroni Constant (modified)
- Euler-Mascheroni Constant Approximations (modified)
- Figural Number
- Figurate Number (modified)
- Missing Dollar Paradox (modified)
- Rectilinear Crossing Number (modified)
- Sierpiński Carpet (modified)
- Sign of the Devil
- Square Antiprism (modified)

### Tuesday September 14, 2004

- Bernoulli Number (modified)
- Binomial Series (modified)
- Binomial Theorem (modified)
- Doublestruck (modified)
- Gamma-Modular Function (modified)
- Hall's Condition
- Universal Algebra (modified)
- Upper Half-Plane (modified)

### Monday September 13, 2004

- Ceiling Function (modified)
- Power Series (modified)

### Friday September 10, 2004

- Absolute Value (modified)

### Thursday September 9, 2004

- Cusp (modified)
- Four-Dimensional Geometry (modified)
- Gelfond's Theorem (modified)
- Improper Subset
- Linkage (modified)
- Proper Subset (modified)
- Sierpiński Constant (modified)
- Totient Summatory Function (modified)
- Weighted Mean (modified)

### Wednesday September 8, 2004

- Semigroup (modified)

### Tuesday September 7, 2004

- Differential Evolution (modified)
- Householder Matrix (modified)
- Hyperbola Evolute (modified)
- Partition Function P (modified)
- Pentagonal Number Theorem (modified)
- q-Series Identities (modified)

### Thursday September 2, 2004

- Archimedes' Cattle Problem (modified)
- Euler Sum (modified)
- Harmonic Number (modified)
- Silver Ratio (modified)
- Totally Imaginary Field

### Wednesday September 1, 2004

- Center of Curvature
- Entire Function (modified)
- Hilbert Number (modified)
- Loess Local Regression
- Operation
- Partial Algebra
- Power Floor Prime Sequence (modified)
- S Distribution
- Topological Algebra
- Topological Partial Algebra
- Unar
- Unary Operation
- Universal Algebra (modified)

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