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An (n-2)-dimensional face of an n-dimensional polytope.

Euclidean n-space is denoted R^n.

An operator definition of a function. A Rodrigues formula may be converted into a Schläfli integral.

A 1×n matrix [a_(11) a_(12) ... a_(1n)].

A surface possessing a saddle point.

A position in a game is safe for a player A if the person who plays next (player B) will lose.

A point at which two noncrossing branches of a curve meet with different tangents.

The word saltus has two different meanings: either a jump or an oscillation of a function.

A formula is called satisfiable if it takes at least one true value in some interpretation.

The modular equation of degree five can be written (u/v)^3+(v/u)^3=2(u^2v^2-1/(u^2v^2)).