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A 4-sphere has positive curvature, with R^2=x^2+y^2+z^2+w^2 (1) 2x(dx)/(dw)+2y(dy)/(dw)+2z(dz)/(dw)+2w=0. (2) Since r=xx^^+yy^^+zz^^ (3) dw = -(xdx+ydy+zdz)/w (4) = ...

There are 14 families of spherical groups, which can be written in orbifold notation as *532, 532, *432, 432, *332, 3*2, 332, *22N, 2*N, 22N, *NN, N*, Nx, and NN.

Stratton (1935), Chu and Stratton (1941), and Rhodes (1970) define the spheroidal functions as those solutions of the differential equation (1) that remain finite at the ...

An object which can be constructed by squaring is called squarable.

A square prism is prism with square base and is therefore a special case of a cuboid.

A type II Markov move.

The measurable space (S^',S^') into which a random variable from a probability space is a measurable function.

(Deltau)_i^2=(u_i-u^_)^2, where u^_ is the average of {u_i}.

The probability of getting a positive result for a given test which should produce a positive result.

Three sets of three lines such that each line is incident with two from both other sets.