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The point of illumination for a caustic.

The quantity under a radical sign.

A conjecture for the eigenvalues of modular forms under Hecke operators.

A type of binary tree.

The words random and stochastic are synonymous.

A measure that takes on real values.

A refinement X of a cover Y is a cover such that every element x in X is a subset of an element y in Y.

A relation R on a set S is reflexive provided that xRx for every x in S.

A reflexive relation.

An open connected set is called a region (sometimes also called a domain).