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An infinite-dimensional differential calculus on the Wiener space, also called stochastic calculus of variations.

The process of computing a matrix inverse.

For b>a>0, 1/b<(lnb-lna)/(b-a)<1/a.

Partial differential equation boundary conditions which give the normal derivative on a surface.

An 18-sided polygon, sometimes also called an octakaidecagon.

The number of "arrangements" in an ordering of n items is given by either a combination (order is ignored) or a permutation (order is significant). An ordering (or order) is ...

Given a pair of orthologic triangles, the point where the perpendiculars from the vertices of the first to the sides of the second concur and the point where the ...

The percentage error is 100% times the relative error.

Let (xi_1,xi_2) be a locally Euclidean coordinate system. Then ds^2=dxi_1^2+dxi_2^2. (1) Now plug in dxi_1=(partialxi_1)/(partialx_1)dx_1+(partialxi_1)/(partialx_2)dx_2 (2) ...

Any geometric correlation which transforms one range into a projectively related pencil (or vice versa).