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An 8-polyiamond.

In the American system, 10^(27).

In the American system, 10^(57).

The appropriate notion of integer for surreal numbers.

A system of parameter chain complexes used for multiplication on differential graded algebras up to homotopy.

A mathematical object upon which an operator acts. For example, in the expression 1×2, the multiplication operator acts upon the operands 1 and 2.

An orbifold is the object obtained by identifying any two points of a map which are equivalent under some symmetry of the map's group.

A simple way to enumerate some types of groups due to J. H. Conway (Zwillinger 1995).

Two subspaces S_1 and S_2 of R^n are said to be orthogonal if the dot product v_1·v_2=0 for all vectors v_1 in S_1 and all v_2 in S_2.

Unit vectors which are orthogonal are said to be orthonormal.