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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.

Two vectors u and v are parallel if their cross product is zero, i.e., uxv=0.

Combine the two above squares on the left into the single large square on the right.

The type of motion executed by a dynamical system containing two incommensurate frequencies.

A point at which two noncrossing branches of a curve meet with different tangents.

The word saltus has two different meanings: either a jump or an oscillation of a function.

Three sets of three lines such that each line is incident with two from both other sets.

Two curves are tangent externally at a point P if they lie on opposite sides of their common tangent at P