TOPICS

Algebra Applied Mathematics Calculus and Analysis Discrete Mathematics Foundations of Mathematics Geometry History and Terminology Number Theory Probability and Statistics Recreational Mathematics Topology

Alphabetical Index New in MathWorld

Geometry

Geometric Duality

Brianchon's Theorem
Cayley Lines
Dual Polyhedron
Dual Tessellation
Duality Principle
Midsphere
Reciprocation

About MathWorld
MathWorld Classroom
Contribute
MathWorld Book
wolfram.com

13,097 Entries
Last Updated: Wed Dec 6 2023
©1999–2023 Wolfram Research, Inc.
Terms of Use

wolfram.com
Wolfram Language
Mathematica
Wolfram Demonstrations
Wolfram for Education

Created, developed and nurtured by Eric Weisstein at Wolfram Research