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In Kepler's 1619 book Harmonice Mundi on tilings, he discussed a tiling built with pentagons, pentagrams, decagons, and "fused decagon pairs." He also called them "monsters." ...

The partial differential equation u_t=del ·(u^mdel u).

The term quartoid is sometimes used to refer to a function on the form f(x,y)=((x^2+y^2)^2)/(a^3), i.e., a poweroid with alpha=4 (Jackway and Deriche 1996).

The 6-polyiamond illustrated above.

The 6-polyiamond illustrated above.

The 6-polyiamond illustrated above, named for its resemblance to the Great Sphinx of Egypt.

A plane-filling arrangement of plane figures or its generalization to higher dimensions. Formally, a tiling is a collection of disjoint open sets, the closures of which cover ...

Two sets T_1 and T_2 are called Wilf equivalent if they belong to the same Wilf class.

The 6-polyiamond illustrated above.

A test which always identifies prime numbers correctly, but may incorrectly identify a composite number as a prime.