# New in *MathWorld* -- December
2004

### Friday December 31, 2004

- Brocard Inellipse (modified)
- Central Circle (modified)
- Circle Function
- Dou Circle (modified)
- Lemoine Inellipse (modified)
- Mannheim Circles
- Second Steiner Circle (modified)
- Steiner Circumellipse (modified)
- Steiner Inellipse (modified)
- Steiner Triangle (modified)

### Thursday December 30, 2004

- Amicable Pair (modified)
- Bell Triangle (modified)
- Fixed Point (modified)
- Leibniz Harmonic Triangle (modified)
- Losanitsch's Triangle (modified)
- Monica Set (modified)
- Permutation Ascent (modified)
- Prime Array (modified)
- Suzanne Set (modified)
- Trigonometry Angles--Pi/13
- Vorobiev's Theorem

### Tuesday December 28, 2004

- Reduced Binary Quadratic Form
- Sum-Free Set (modified)
- Sumset

### Sunday December 26, 2004

- Abel's Integral
- Almost Perfect Number (modified)
- Circle-Circle Tangents (modified)
- Definite Integral (modified)
- External Similitude Center (modified)
- Internal Similitude Center (modified)
- Least Deficient Number (modified)

### Saturday December 25, 2004

- Chrystal's Identity
- Folding (modified)
- Isodynamic Circles
- Sierpiński Sieve (modified)
- Steiner Circumellipse (modified)
- Steiner Triangle (modified)

### Friday December 24, 2004

### Thursday December 23, 2004

- Apollonius Circle (modified)
- Self-Isotomic Cubic

### Wednesday December 22, 2004

- McCay Circles Radical Circle
- Perfect Cuboid (modified)
- Radical Circle (modified)
- Self-Isogonal Cubic (modified)

### Tuesday December 21, 2004

- Central Circle (modified)
- Excircles (modified)
- First Brocard Triangle (modified)
- McCay Circles (modified)
- Mixtilinear Circle
- Mixtilinear Incircles (modified)
- Mixtilinear Incircles Radical Circle
- Neuberg Circles (modified)
- Pythagorean Triple (modified)
- Radical Circle (modified)
- Second Brocard Triangle (modified)
- Tangent Circles (modified)

### Monday December 20, 2004

- Lattice Homomorphism (modified)
- Mixtilinear Incircles (modified)
- Mixtilinear Triangle
- Pythagorean Triple (modified)
- Smale's Problems (modified)
- Twin Pythagorean Triple

### Sunday December 19, 2004

- 0,1-Simple Lattice
- Arc Component
- Between (modified)
- Central Circle (modified)
- Circumcircle (modified)
- Decomposable Continuum
- Dendrite (modified)
- Enlargement (modified)
- Extangents Circle
- Extangents Triangle (modified)
- Half-Altitude Circle
- Hereditarily Decomposable Continuum
- Hyper-P Algebra
- Indecomposable Continuum
- Intangents Circle
- Intangents Triangle (modified)
- Internally Extendable Homomorphism
- Jacobian Conjecture (modified)
- Join-Embedding
- Join-Endomorphism
- Join-Homomorphism
- Join-Isomorphism
- Lattice (modified)
- Lattice Automorphism
- Lattice Endomorphism
- Lattice Isomorphism
- Lattice Polarity
- Lattice Tolerance
- Locally Bounded Lattice
- Locally Realized Covering Relation
- Locally Subbounded Lattice
- Local Polarity
- Meet-Embedding
- Meet-Endomorphism
- Meet-Homomorphism
- Meet-Isomorphism
- Modular Inverse
- Perfect Cuboid (modified)
- Point Lattice (modified)
- PowerMod
- Saturated Enlargement
- Semidefinite Programming
- Strictly Between
- Tight Lattice

### Saturday December 18, 2004

- Central Circle (modified)
- Circumcevian Triangle (modified)
- Circumcircle (modified)
- Circumconic (modified)
- Condition Number (modified)
- Cyclocevian Conjugate (modified)
- Cyclocevian Triangle
- Droz-Farny Line Theorem
- Excentral Triangle (modified)
- Half-Altitude Triangle (modified)
- Incentral Triangle (modified)
- MacBeath Circumconic
- MacBeath Inconic (modified)
- MatrixConditionNumber
- Medial Circle (modified)
- Medial Triangle (modified)
- Miquel's Pivot Theorem
- Orthic Circle
- Orthic Triangle (modified)
- Pedal Triangle (modified)
- Perspector (modified)
- Perspectrix (modified)
- Second Steiner Circle
- Symmedial Circle
- Symmedial Triangle (modified)
- Tangential Triangle (modified)

### Friday December 17, 2004

- Apollonius Circle (modified)
- Bevan Circle (modified)
- Bow (modified)
- Brocard Circle (modified)
- Contact Triangle (modified)
- Extouch Triangle (modified)
- Fuhrmann Circle (modified)
- Hexagram (modified)
- Incircle (modified)
- Kimberling Center (modified)
- Knot Curve (modified)
- Landau-Mignotte Bound (modified)
- Lester Circle (modified)
- Mandart Circle (modified)
- Nine-Point Circle (modified)
- Sine-Triple-Angle Circle (modified)
- Spieker Circle (modified)
- Star of Lakshmi (modified)
- Tangential Triangle (modified)
- Zassenhaus-Berlekamp Algorithm (modified)

### Thursday December 16, 2004

- Bow (modified)
- Conjunctive Normal Form (modified)
- Eight Curve (modified)
- Extouch Triangle (modified)
- Hexagram (modified)
- Knot Curve (modified)
- Landau-Mignotte Bound (modified)
- Mandart Circle (modified)
- Mixtilinear Incircles
- Polygram (modified)
- Presburger Arithmetic
- Ruth-Aaron Pair (modified)
- SOHCAHTOA
- Unicursal Circuit (modified)

### Wednesday December 15, 2004

- Eight Curve (modified)
- Keratoid Cusp (modified)
- Proportionally-Cutting Circle (modified)

### Tuesday December 14, 2004

- Ampersand Curve (modified)
- Apollonius Circle (modified)
- Bean Curve (modified)
- Bicuspidal Curve
- Bicuspid Curve (modified)
- Bow (modified)
- Butterfly Curve (modified)
- Knot Curve (modified)
- Tucker Circles (modified)
- Tucker Hexagon (modified)

### Monday December 13, 2004

- Kiepert Parabola (modified)
- Lemoine Inellipse (modified)
- MacBeath Inconic (modified)
- MacBeath Triangle (modified)
- Mandart Inellipse (modified)
- Orthic Inconic (modified)
- Osculating Circle (modified)
- Proportionally-Cutting Circle
- Stammler Circles
- Stammler Triangle
- Steiner Inellipse (modified)
- Yff Parabola (modified)

### Sunday December 12, 2004

- Absolute Involution
- Asymptotic Series (modified)
- Bernoulli Polynomial (modified)
- e (modified)
- Extension Monad
- Factorial (modified)
- Hyperfinitely Generated Algebra
- Isotropic Line (modified)
- Landau-Mignotte Bound
- Local P-Algebra (modified)
- Maclaurin Series (modified)
- Magic Hexagon (modified)
- Mignotte Bound
- Orthogonal Involution
- Pair Groupoid
- Polynomial (modified)
- Strong Variety
- Trivial Bundle

### Saturday December 11, 2004

- Brianchon Point (modified)
- Brocard Inellipse (modified)
- First Neuberg Triangle (modified)
- Kiepert Parabola (modified)
- Lemoine Triangle
- MacBeath Triangle
- Perspector (modified)
- Perspectrix (modified)
- Steiner Triangle
- Symmedial Triangle

### Friday December 10, 2004

- Accumulate
- Antipode (modified)
- Cumulative Sum (modified)
- Double Series (modified)
- Eigenvalue (modified)
- Eigenvalues
- Eigenvector (modified)
- Eigenvectors
- Map Germ (modified)
- Principle of Insufficient Reason (modified)
- Rabbit-Duck Illusion (modified)
- Riemann Zeta Function zeta(2) (modified)
- Steiner Inellipse (modified)
- Transcendental Number (modified)

### Thursday December 9, 2004

- Aitken's Delta-Squared Process (modified)
- Circular Point at Infinity (modified)
- Excircles (modified)
- Excircles Radical Circle
- Isotropic Line (modified)
- MacBeath Inconic (modified)
- Neuberg Circles (modified)
- Power Circles (modified)
- Radical Line (modified)
- Stevanović Circle (modified)
- Totient Function (modified)

### Wednesday December 8, 2004

- Aitken's Array
- Almost Integer (modified)
- Anticomplement (modified)
- Bell Triangle (modified)
- Busy Beaver (modified)
- Circular Point at Infinity
- Complement (modified)
- Euler Line (modified)
- Excircles (modified)
- Isotropic Point
- Line at Infinity (modified)
- Nagel Line (modified)
- Neuberg Circles (modified)
- Neuberg Cubic (modified)
- Orthic Axis (modified)
- Peirce Triangle
- Perspector (modified)
- Perspectrix (modified)
- Power Circles (modified)
- Tangent Circles (modified)

### Tuesday December 7, 2004

- Almost Integer (modified)
- First Neuberg Triangle (modified)
- Hardy-Littlewood Constant
- Hardy-Littlewood Constants
- Line (modified)
- Line-Line Intersection (modified)
- Neuberg Circles (modified)

### Monday December 6, 2004

- 15 Puzzle (modified)
- Antiorthic Axis (modified)
- Bounded Lattice
- Complemented Lattice
- de Longchamps Circle (modified)
- Excircles (modified)
- Feigenbaum Constant Approximations (modified)
- Gergonne Line (modified)
- Incircle (modified)
- Khinchin's Constant Approximations
- Lattice (modified)
- Lattice Homomorphism
- Lattice-Ordered Set
- Orthic Axis (modified)
- Partially Ordered Set (modified)
- Perspectrix (modified)
- Polyomino Tiling (modified)
- Radical Circle (modified)
- Spieker Center (modified)
- Tangent Circles (modified)
- Uniquely Complemented Lattice
- Variety

### Sunday December 5, 2004

- Antiorthic Axis (modified)
- Bevan Point (modified)
- Brocard Midpoint (modified)
- Circumcenter (modified)
- Circumcircle Mid-Arc Triangle
- de Longchamps Line (modified)
- Fuhrmann Center (modified)
- Fuhrmann Triangle (modified)
- Gergonne Line (modified)
- Incenter (modified)
- Inner Soddy Center (modified)
- Lemoine Axis (modified)
- Nine-Point Center (modified)
- Orthic Axis (modified)
- Orthocenter (modified)
- Perspector (modified)
- Reflection (modified)
- Spieker Center (modified)
- Symmedian Point (modified)
- Taylor Center (modified)

### Saturday December 4, 2004

- First Lemoine Circle (modified)
- Radical Line (modified)

### Friday December 3, 2004

### Thursday December 2, 2004

- Central Circle (modified)
- Half-Moses Circle
- Incircle (modified)
- Johnson's Theorem (modified)
- Moses Circle (modified)
- Steiner Circle (modified)
- Tangent Circles (modified)
- Triquetra (modified)

### Wednesday December 1, 2004

- Circle (modified)

[ 2024 ▪ 2023 ▪ 2022 ▪ 2021 ▪ 2020 ▪ 2019 ▪ 2018 ▪ 2017 ▪ 2016 ▪ 2015 ▪ 2014 ▪ 2013 ▪ 2012 ▪ 2011 ▪ 2010 ▪ 2009 ▪ 2008 ▪ 2007 ▪ 2006 ▪ 2005 ▪ 2004 ▪ 2003 ▪ 2002 ▪ 2001 ▪ 2000 ▪ 1999 ]