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An archaic name for topology.

A statistical distribution having two separated peaks.

An area-preserving affine transformation. Equiaffinities include the crossed hyperbolic rotation, elliptic rotation, hyperbolic rotation, and parabolic rotation.

Given a subspace A of a space X and a map from A to a space Y, is it possible to extend that map to a map from X to Y?

Johnson solid J_(24).

A property of a space which is also true of each of its subspaces. Being "first-countable" is hereditary, but having a given genus is not.

n sets of s trials each, with the probability of success p constant in each set. var(x/n)=spq+s(s-1)sigma_p^2, where sigma_p^2 is the variance of p_i.

(x^2+axy+by^2)(t^2+atu+bu^2)=r^2+ars+bs^2, (1) where r = xt-byu (2) s = yt+xu+ayu. (3)

A formula whose truth table contains only false in any interpretation is called unsatisfiable.

The term "aliquot divisor" is commonly used to mean two distinct but related things. The first definition is a number that divides another exactly. For instance, 1, 2, 3, and ...