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A 13-sided polygon, sometimes also called the triskaidecagon.

The trilinear quotient of two points p:q:r and u:v:w is the point p/u:q/v:r/w.

Possessing a three equivalent modes.

A polynomial with three terms.

(x^2+axy+by^2)(t^2+atu+bu^2)=r^2+ars+bs^2, (1) where r = xt-byu (2) s = yt+xu+ayu. (3)

When A and B are self-adjoint operators, e^(t(A+B))=lim_(n->infty)(e^(tA/n)e^(tB/n))^n.

A vector field on a circle in which the directions of the vectors are all at the same angle to the circle.

A rotation combined with an expansion or geometric contraction.

The Reidemeister move of type I.

psi=(A_0+alpha_1A_1+alpha_2A_2+...)e^(iS/alpha).