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An enneacontahedron is a 90-faced polyhedron.

The exists quantifier exists .

An operator of period 2, i.e., an operator * which satisfies ((a)^*)^*=a.

A function used to study ordinary differential equations.

A minimization of the maximum error for a fixed number of terms.

Topological lower bounds in terms of Betti numbers for the number of critical points form a smooth function on a smooth manifold.

A strong inequality in which a is not only less than b, but much less (by some convention) is denoted a<<b.

Given a function f(x) of a variable x tabulated at m values y_1=f(x_1), ..., y_m=f(x_m), assume the function is of known analytic form depending on n parameters ...

A quantity that is nonzero everywhere is said to be nonvanishing. For instance, the values of x^2+1 are nonvanishing for real x, while those of x^2 are not (since x^2 ...

An angle which is not a right angle or a multiple of a right angle.