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

The Jordan product of quantities x and y is defined by x·y=1/2(xy+yx).

Keller conjectured that tiling an n-dimensional space with n-dimensional hypercubes of equal size yields an arrangement in which at least two hypercubes have an entire ...

An 8-polyiamond.

One of the four 5-polyiamonds are called pentiamonds.

1%.

The point with respect to which a radial curve is computed.

The unit of solid angle. The solid angle corresponding to all of space being subtended is 4pi steradians.

The p-adic norm satisfies |x+y|_p<=max(|x|_p,|y|_p) for all x and y.

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