# New in *MathWorld* -- January
2005

### Monday January 31, 2005

- Allais Paradox (modified)
- Cevian Circle (modified)
- Connection Game (modified)
- Hyperstring
- Independence Axiom (modified)
- Integer Sequence Primes (modified)
- Inverse Erf (modified)
- Transparallel Processing

### Sunday January 30, 2005

- Anticomplementary Triangle (modified)
- Bickart Points (modified)
- Brocard Inellipse (modified)
- Circumcircle (modified)
- Contact Triangle (modified)
- Cross Conjugate
- Dodecahedron (modified)
- Extouch Triangle (modified)
- First Yff Triangle
- Incircle (modified)
- Kiepert Parabola (modified)
- Lemoine Inellipse (modified)
- Lemoine Triangle (modified)
- MacBeath Inconic (modified)
- MacBeath Triangle (modified)
- Mandart Inellipse (modified)
- Medial Triangle (modified)
- Orthic Inconic (modified)
- Orthic Triangle (modified)
- Perspector (modified)
- Perspectrix (modified)
- Polar Circle (modified)
- Polar Triangle (modified)
- Reference Triangle (modified)
- Second Yff Triangle
- Self-Polar Triangle (modified)
- Stammler Hyperbola (modified)
- Steiner Circumellipse (modified)
- Steiner Inellipse (modified)
- Steiner Triangle (modified)
- Symmedial Triangle (modified)
- Tangential Triangle (modified)
- Yff Contact Triangle (modified)
- Yff Parabola (modified)

### Saturday January 29, 2005

- Circumconic (modified)
- Cube Line Picking (modified)
- Excentral-Hexyl Ellipse
- Excentral Triangle (modified)
- Heap (modified)
- Hexyl Triangle (modified)
- Second Droz-Farny Circle (modified)
- Stammler Circles Radical Circle (modified)

### Friday January 28, 2005

- Line Line Picking (modified)
- Minesweeper
- Nine-Point Circle (modified)
- Point-Point Distance--1-Dimensional (modified)
- Square Line Picking (modified)
- Stammler Circles Radical Circle (modified)

### Thursday January 27, 2005

- Circumcircle (modified)
- Circumhyperbola (modified)
- Connection Game
- Feigenbaum Constant Approximations (modified)
- Feigenbaum Function (modified)
- Game of Hex (modified)
- Oddest Prime
- Prime Number (modified)
- Quartile (modified)
- Reflection Circle (modified)
- Reflection Triangle (modified)
- Simson Line (modified)
- Square Triangle Picking (modified)

### Wednesday January 26, 2005

- Bernoulli Number (modified)
- Circle Function (modified)
- Circle Power (modified)
- Cork Plug (modified)
- Euler Number (modified)
- Nine-Point Circle (modified)
- Yff Parabola (modified)

### Tuesday January 25, 2005

- Apéry's Constant (modified)
- Cork Plug (modified)
- Cube Line Picking (modified)
- Even Prime (modified)
- Feigenbaum Constant Approximations (modified)
- Fibonacci Number (modified)
- Fibonacci Prime
- Fundamental Theorem of Arithmetic (modified)
- Hadjicostas's Formula (modified)
- Integer Sequence Primes (modified)
- Lucas Number (modified)
- Odd Prime (modified)
- Squarefree Factorization
- Syzygy (modified)
- Trip-Let (modified)

### Monday January 24, 2005

- Circumcircle (modified)
- Diafix
- Discrete Group (modified)
- Musselman's Theorem
- Radical Circle (modified)
- Reflection Circle
- Reflection Triangle
- Stammler Circles (modified)
- Stammler Circles Radical Circle
- Stammler Hyperbola (modified)

### Sunday January 23, 2005

- Feigenbaum Constant Approximations (modified)
- Feigenbaum Function (modified)
- Graph Isomorphism (modified)
- Hadjicostas's Formula
- Integer Sequence Primes (modified)
- Legendre Polynomial (modified)
- Near-Square Prime (modified)
- Prime Sums (modified)
- Sophie Germain Prime (modified)

### Saturday January 22, 2005

- Crosspoint
- Crosssum
- Ehrmann Congruent Squares Point
- Euler-Gergonne-Soddy Circle
- Euler-Gergonne-Soddy Triangle (modified)
- First Neuberg Circle
- First Neuberg Triangle (modified)
- Inner Inscribed Squares Triangle
- Lucas Central Circle (modified)
- Newton's Method (modified)
- Outer Inscribed Squares Triangle
- Perspector (modified)
- Second Neuberg Circle
- Second Neuberg Triangle
- Yff Central Circle
- Yff Central Triangle (modified)

### Friday January 21, 2005

- Central Circle (modified)
- Cevian Circle (modified)
- Concentric (modified)
- Divisor Function (modified)
- Even Perfect Number
- First Morley Center
- Hexyl Circle
- Hexyl Triangle (modified)
- Lucas Central Triangle (modified)
- Lucas Tangents Triangle (modified)
- MacBeath Circle
- MacBeath Triangle (modified)
- Morley's Circle
- Orthic Axis (modified)
- Power (modified)
- Second Morley Center
- Stammler Circle (modified)
- Triangle Square Inscribing (modified)

### Thursday January 20, 2005

- 4 (modified)
- External Similitude Center (modified)
- Factorial Products (modified)
- Internal Similitude Center (modified)
- Prime Counting Function (modified)
- Prime Number (modified)
- Quadratic
- Smarandache Function (modified)
- Spieker Radical Circle
- Wilson's Theorem (modified)
- Yff Circles (modified)

### Wednesday January 19, 2005

- Central Circle (modified)
- Circumcircle (modified)
- Harmonic Mean (modified)
- Heronian Mean (modified)
- Inner Vecten Circle
- Inner Vecten Triangle
- Johnson-Yff Circles
- Outer Vecten Circle
- Outer Vecten Triangle
- Perspector (modified)
- Pi Wordplay (modified)

### Tuesday January 18, 2005

- Central Circle (modified)
- Circumcircle (modified)
- Pythagorean Triple (modified)
- Statistical Distribution (modified)
- Yff Circles
- Yff Contact Circle
- Yff Contact Triangle (modified)
- Yff Parabola (modified)
- Yff Points (modified)

### Monday January 17, 2005

- Chasles's Polar Triangle Theorem
- Conway Triangle Notation (modified)
- Dou Circle (modified)
- Ladder Graph (modified)
- Least Common Multiple (modified)
- Perspector (modified)
- Polar Triangle (modified)
- Ramanujan Constant (modified)
- Self-Polar Triangle
- Thébault's Theorem

### Sunday January 16, 2005

- Anticomplementary Circle
- Anticomplementary Triangle (modified)
- Central Circle (modified)
- Central Line (modified)
- Circumcircle (modified)
- de Longchamps Line (modified)
- Droz-Farny Circles (modified)
- Evans Conic (modified)
- External Center of Similitude
- First Droz-Farny Circle (modified)
- First Morley Adjunct Triangle
- First Morley Triangle (modified)
- Incentral Circle
- Incentral Triangle (modified)
- Inner Napoleon Circle
- Inner Napoleon Triangle
- Internal Center of Similitude
- Lucas Central Circle
- Lucas Central Triangle (modified)
- Outer Napoleon Circle
- Outer Napoleon Triangle
- Reuleaux Tetrahedron (modified)
- Second Droz-Farny Circle (modified)
- Stammler Circle
- Stammler Triangle (modified)
- Tangent (modified)
- Tangential Mid-Arc Circle
- Tangential Mid-Arc Triangle (modified)
- Yff Contact Triangle
- Yff Hyperbola (modified)

### Saturday January 15, 2005

- Algebraic Number (modified)
- Algebraic Number Minimal Polynomial (modified)
- Ascending Factorial
- Bevan Point (modified)
- Cocktail Party Graph (modified)
- Euler-Mascheroni Constant (modified)
- Extangents Circle (modified)
- Gamma Function (modified)
- Graph Union (modified)
- Hyperoctahedral Graph
- Intangents Circle (modified)
- Ladder Graph (modified)
- Log Gamma Function
- Log Sine Function
- Minimal Polynomial
- Pi Formulas (modified)
- Pochhammer Symbol (modified)
- Prime Constant (modified)
- Riemann Zeta Function (modified)
- Serret's Integral
- Vandermonde's Formula
- Weierstrass Constant (modified)

### Friday January 14, 2005

- Gaussian Triangle Picking (modified)
- Goldbach Conjecture (modified)
- Hajós Group (modified)

### Thursday January 13, 2005

- Conway Triangle Notation
- Curtate Cycloid (modified)
- Ellipticity (modified)
- Evil Number (modified)
- Flattening (modified)
- Hajós Group
- Hendecagon (modified)
- Lucas Inner Triangle
- Oblate Spheroid (modified)
- Odious Number
- Triangle Interior (modified)

### Wednesday January 12, 2005

- Euler-Mascheroni Constant (modified)
- Evans Conic (modified)
- Fuglede's Conjecture (modified)
- Lemoine Axis (modified)
- Lucas Circles (modified)
- Near-Square Prime (modified)
- Stammler Hyperbola (modified)
- Steiner Inellipse (modified)

### Tuesday January 11, 2005

- Demiregular Tessellation (modified)
- Fuglede's Conjecture (modified)
- Gallatly Circle (modified)
- Lucas Circles (modified)
- Tucker Circles (modified)

### Monday January 10, 2005

- Definite Integral (modified)
- Homologic Triangles
- Infinite Cosine Product Integral
- Lucas Cubic (modified)
- Orthologic Triangles (modified)
- Uniform Ratio Distribution (modified)

### Sunday January 9, 2005

- Brocard Angle (modified)
- Perspectrix (modified)

### Saturday January 8, 2005

- Amenable Number (modified)
- Neuberg Cubic (modified)
- Perspector (modified)
- Poristic Triangles
- Trilinear Polar (modified)
- Trilinear Pole (modified)
- Tripolar
- Tripolar Coordinates
- Tripole
- Yiu Circles (modified)
- Yiu Triangle (modified)

### Friday January 7, 2005

- Dirichlet L-Series (modified)

### Thursday January 6, 2005

### Wednesday January 5, 2005

- Circumcircle (modified)
- Inverse Function Integration
- Kiepert Hyperbola (modified)
- Lucas Circles Radical Circle
- Lucas Cubic (modified)
- Nearest Neighbor
- Nearest Neighbor Problem (modified)
- Pivotal Isotomic Cubic (modified)
- Radical Circle (modified)

### Tuesday January 4, 2005

- Cube Root (modified)
- Feuerbach Hyperbola (modified)
- Half-Angle Formulas (modified)
- Jerabek Hyperbola (modified)
- Lucas Central Triangle
- Lucas Circles
- Lucas Tangents Triangle

### Monday January 3, 2005

- Circle Function (modified)
- Parry Circle (modified)
- Yiu Circles (modified)

### Sunday January 2, 2005

- Circumhyperbola
- Cube Root (modified)
- Factorial Products (modified)
- Feigenbaum Constant Approximations (modified)
- Second Steiner Circle (modified)
- Steiner Circumellipse (modified)
- Yiu Circle (modified)
- Yiu Circles (modified)

### Saturday January 1, 2005

- Bickart Points
- D-Triangle (modified)
- Yiu Circle
- Yiu Circles
- Yiu Triangle

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