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The (interior) bisector of an angle, also called the internal angle bisector (Kimberling 1998, pp. 11-12), is the line or line segment that divides the angle into two equal ...

A two-dimensional map also called the Taylor-Greene-Chirikov map in some of the older literature and defined by I_(n+1) = I_n+Ksintheta_n (1) theta_(n+1) = theta_n+I_(n+1) ...

Two lines that lie on top of one another are called coincident lines.

If the consistency of one of two propositions implies the consistency of the other, the first is said to have greater consistency strength.

The difference of two numbers n_1 and n_2 is n_1-n_2, where the minus sign denotes subtraction.

A polynomial form which is the sum of two polynomial forms involving separate sets of variables.

A mathematical statement of the equivalence of two quantities. The equality "A is equal to B" is written A=B.

Two nonsingular forms are equivalent over the rationals iff they have the same determinant and the same p-signatures for all p.

Two graphs are homeomorphic if there is a graph isomorphism from some graph subdivision of one to some subdivision of the other.

The problem of deciding if two knots in three-space are equivalent such that one can be continuously deformed into another.