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A set with three elements.

An integer n which is tested to see if it divides a given number.

The unique 3-polyiamond, illustrated above.

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.

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

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).