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A 5-polyabolo.

One of the four 5-polyiamonds are called pentiamonds.

A heptomino in the shape of the Greek character pi.

The Schröder number S_n is the number of lattice paths in the Cartesian plane that start at (0, 0), end at (n,n), contain no points above the line y=x, and are composed only ...

One of the 14 4-polyaboloes.

The three 3-polyiamonds are called tetriamonds.

One of the four 3-polyaboloes.

The unique 3-polyiamond, illustrated above.

A general prism is a polyhedron possessing two congruent polygonal faces and with all remaining faces parallelograms (Kern and Bland 1948, p. 28; left figure). A right prism ...

Let L=(L, ^ , v ) and K=(K, ^ , v ) be lattices, and let h:L->K. If h is one-to-one and is a join-homomorphism, then it is a join-embedding.