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A Blaschke product is an expression of the form B(z)=z^mproduct_(j=1)^infty-(a^__j)/(|a_j|)B_(a_j)(z), where m is a nonnegative integer and z^_ is the complex conjugate.

A common mechanism which generates singularities from smooth initial conditions.

A ring with a unit element in which every element is idempotent.

Every continuous map f:S^n->R^n must identify a pair of antipodal points.

The statistical index P_B=1/2(P_L+P_P), where P_L is Laspeyres' index and P_P is Paasche's index.

A Mandelbrot set-like fractal obtained by iterating the map z_(n+1)=z_n^3+(z_0-1)z_n-z_0.

An even Walsh function with sequency k defined by Cal(n,k)=W(n,2k+1).

If bc=bd (mod a) and (b,a)=1 (i.e., a and b are relatively prime), then c=d (mod a).

A clear-cut way of describing every object in a class in a one-to-one manner.

The antisymmetric parts of the Christoffel symbol of the second kind Gamma^lambda_(munu).