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Let A be a C^*-algebra, then an element a in A is called normal if aa^*=a^*a.

The study of numbers for the supposed purpose of predicting future events or seeking connections with the occult.

A map is called "one-to-one" (or "1:1") if it is injective. However, being in "one-to-one correspondence" is synonymous with being a bijection. Unfortunately, this confusing ...

A map which sends open sets to open sets.

The theory and applications of Laplace transforms and other integral transforms.

The central point (r=0) in polar coordinates, or the point with all zero coordinates (0, ..., 0) in Cartesian coordinates. In three dimensions, the x-axis, y-axis, and z-axis ...

The pentagrammic dipyramid is the dual polyhedron of the pentagrammic prism U_(78).

For every k>1, there exist only finite many pairs of powers (p,p^') with p and p^' natural numbers and k=p^'-p.

The addition of two quantities, i.e., a plus b. The operation is denoted a+b, and the symbol + is called the plus sign. Floating-point addition is sometimes denoted direct ...

The index of a vector field with finitely many zeros on a compact, oriented manifold is the same as the Euler characteristic of the manifold.