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A "line" having imaginary coefficients in its equations which can arise in algebraic geometry.

A fixed point for which the stability matrix has equal nonzero eigenvectors.

A curve created by starting with a circle, dividing it into six arcs, and flipping three alternating arcs. The process is then repeated an infinite number of times.

A word or string which is not admissible.

The incidence matrix of a graph gives the (0,1)-matrix which has a row for each vertex and column for each edge, and (v,e)=1 iff vertex v is incident upon edge e (Skiena ...

Two objects which touch each other are said to be incident.

A spherical image of a curve. The most common indicatrix is Dupin's indicatrix.

If f:(X,A)->(Y,B) is homotopic to g:(X,A)->(Y,B), then f_*:H_n(X,A)->H_n(Y,B) and g_*:H_n(X,A)->H_n(Y,B) are said to be the induced maps.

The fifth of Peano's axioms, which states: If a set S of numbers contains zero and also the successor of every number in S, then every number is in S.

While an equality A=B states that two mathematical expressions are equal, an inequation A!=B states that two expressions are not equal.