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A vector specifying how layers are stacked in a laminated lattice.

Johnson solid J_(47).

The vectors +/-a_1, ..., +/-a_n in a three-space form a normalized eutactic star iff Tx=x for all x in the three-space.

Objects which are identical except for a mirror reflection are said to display handedness and to be chiral.

Two nonsingular forms are equivalent over the rationals iff they have the same determinant and the same p-signatures for all p.

The head of a vector AB^-> is the endpoint B, i.e., the point at which the arrow is placed.

A spherical image of a curve. The most common indicatrix is Dupin's indicatrix.

An operator of period 2, i.e., an operator * which satisfies ((a)^*)^*=a.

An integral of motion which restricts the phase space available to a dynamical system.

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