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The Season 1 episode "Sacrifice" (2005) of the television crime drama NUMB3RS mentions econometrics.

sum_(i=1)^n((partialu)/(partialx_i))^2=1.

Ein(z) = int_0^z((1-e^(-t))dt)/t (1) = E_1(z)+lnz+gamma, (2) where gamma is the Euler-Mascheroni constant and E_1 is the En-function with n=1.

A positive-height (outward-pointing) pyramid used in augmentation. The term was introduced by B. Grünbaum.

A space endowed with a non-Euclidean elliptic geometry.

Of opposite symmetry under reflection; mirror images.

A 90-sided polygon.

An enneacontahedron is a 90-faced polyhedron.

A 19-sided polygon, sometimes also called the enneakaidecagon.

A mathematical statement of the equivalence of two quantities. The equality "A is equal to B" is written A=B.