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A ball of radius 1.

A transformation of the form A^'=UAU^(H), where U^(H) denotes the conjugate transpose.

Capable of taking on exactly one possible value.

A function of a single variable (e.g., f(x), g(z), theta(xi), etc.).

If A is true unless B, then not-B implies A, but B does not necessarily imply not-A.

A homogeneous ideal defining a projective algebraic variety is unmixed if it has no embedded prime divisors.

Kepler's original name for the small stellated dodecahedron.

A generalization of the p-adic norm first proposed by Kürschák in 1913. A valuation |·| on a field K is a function from K to the real numbers R such that the following ...

If s_x is the standard deviation of a set of samples x_i and x^_ their mean, then the variation coefficient is defined as V=(s_x)/(x^_).

The magnitude (length) of a vector x=(x_1,x_2,...,x_n) is given by |x|=sqrt(x_1^2+x_2^2+...+x_n^2).