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A Greek cross rotated by 45 degrees, also called the crux decussata, illustrated schematically above in polyomino form. The multiplication sign × is based on Saint Andrew's ...

An odd Walsh function with sequency k defined by Sal(n,k)=W(n,2k).

For R[z]>0, where J_nu(z) is a Bessel function of the first kind.

The problem of determining the vertices of a Schwarz-Christoffel mapping (Krantz 1999, p. 176).

Any motion of a rigid body in space at every instant is a screw motion. This theorem was proved by Mozzi and Cauchy.

A morphism f:X->Y is said to be separable if K(X) is a separable extension of K(Y).

The distance a point moves due to shear divided by the perpendicular distance of a point from the invariant line.

The shoelace formula, also known as Gauss's area formula, the shoelace algorithm, shoelace method, or surveyor's formula, is a name sometimes given to the polygon area ...

A sigma-compact topological space is a topological space that is the union of countably many compact subsets.

A family composed of countably many locally finite families.