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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.

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.

The Reidemeister move of type I.

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