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GEM Subject is
176 - 180
Unsolved problems on perfect graphs, a collection for people with at least a basic knowledge of the subject. Contents include: Perfection of special classes of Berge graphs; Recognition of special classes of Berge...
The Four Colour Theorem
Linked essay describing work on the theorem from its posing in 1852 through its solution in 1976, with two other web sites and 9 references (books/articles).
A short article designed to provide an introduction to algebraic geometry, which combines the algebraic with the geometric for the benefit of both. Thus the recent proof of "Fermat's Last Theorem" - ostensibly a...
The Many Ways to Construct a Triangle
In general, a triangle is defined by its three elements. SAS, ASA, and SSS provide three well-known examples but there are many more. Bogomolny provides a table of constructions (linked to constructions) and invites...
A growing collection of over 1000 virtual reality polyhedra to explore, complementing Hart's
Pavilion of Polyhedreality.
Includes instructions for building
paper models of polyhedra
including modular origami, with ideas...
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