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The term used in propositional calculus for the NOR connective. The notation AvB is used for this connective.

A transformation of an algebraic curve which is of the same type as its inverse. A Jonquière's transformation is always factorable.

The identity (xy)x^2=x(yx^2) satisfied by elements x and y in a Jordan algebra.

A geodesic triangle with oriented boundary yields a curve which is piecewise differentiable. Furthermore, the tangent vector varies continuously at all but the three corner ...

A bistable eight-sided polyhedron discovered by Wunderlich and Schwabe (1986).

An optical illusion, illustrated above, in which the eye perceives a white upright equilateral triangle where none is actually drawn.

A theorem which states that if a Kähler form represents an integral cohomology class on a compact manifold, then it must be a projective Abelian variety.

n divides a^n-a for all integers a iff n is squarefree and (p-1)|(n-1) for all prime divisors p of n. Carmichael numbers satisfy this criterion.

The system of ordinary differential equations (dm)/(dt) = lambdamxm+gammax1 (1) (dgamma)/(dt) = lambdagammaxm. (2)

The characteristic escape rate from a stable state of a potential in the absence of signal.