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Oriented in position perpendicular to up-down, and therefore parallel to a flat surface.

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

A k×n Latin rectangle is a k×n matrix with elements a_(ij) in {1,2,...,n} such that entries in each row and column are distinct. If k=n, the special case of a Latin square ...

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.

A bicupola in which the bases are in the same orientation.

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.