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A dual bivector is defined by X^~_(ab)=1/2epsilon_(abcd)X^(cd), and a self-dual bivector by X_(ab)^*=X_(ab)+iX^~_(ab).

Can be used to invert a Laplace transform.

In the American system, 10^(39).

Each centered convex body of sufficiently high dimension has an "almost spherical" k-dimensional central section.

Not concentric.

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.