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Let |sum_(n=1)^pa_n|<K, (1) where K is independent of p. Then if f_n>=f_(n+1)>0 and lim_(n->infty)f_n=0, (2) it follows that sum_(n=1)^inftya_nf_n (3) converges.

Of opposite symmetry under reflection; mirror images.

When referring to a planar object, "fixed" means that the object is regarded as fixed in the plane so that it may not be picked up and flipped. As a result, mirror images are ...

dtau^2=-eta_(alphabeta)dxi^alphadxi^beta, or (d^2xi^alpha)/(dtau^2)=0.

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.

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.