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A relation R on a set S is transitive provided that for all x, y and z in S such that xRy and yRz, we also have xRz.

A transversal line is a line which intersects each of a given set of other lines. It is also called a semisecant.

A lottery in which three numbers are picked at random from the integers 1-14.

One of the four 3-polyaboloes.

A set with three elements.

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.

A polynomial with three terms.

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