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J_(nualphabeta)^mu=J_(nubetaalpha)^mu=1/2(R_(alphanubeta)^mu+R_(betanualpha)^mu), where R is the Riemann tensor.

A general concept in category theory involving the globalization of local morphisms.

An angle which is not a right angle or a multiple of a right angle.

Two vectors u and v are parallel if their cross product is zero, i.e., uxv=0.

An operator in logic which returns either true or false.

The conjugate of a quaternion a=a_1+a_2i+a_3j+a_4k is defined by a^_=a_1-a_2i-a_3j-a_4k.

A shift in phase.

A system of equations is any set of simultaneous equations.

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

A stereogram made of two pictures, one red and one blue, taken from offset positions. When the pictures are viewed through glasses with one lens of each color, the picture ...