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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.

A formula whose truth table contains only false in any interpretation is called unsatisfiable.

Kepler's original name for the small stellated dodecahedron.

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).

If the first nonzero component of the vector difference A-B is >0, then A≻B. If the first nonzero component of A-B is <0, then A≺B.

Vector subtraction is the process of taking a vector difference, and is the inverse operation to vector addition.

The symbol v variously means "disjunction" (i.e., OR in logic) or "join" (for a lattice).

Oriented in an up-down position.