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

A divisor which is not a proper divisor.

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 number of inward directed graph edges from a given graph vertex in a directed graph.

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

A group having an infinite number of elements. Some infinite groups, such as the integers or rationals, are not continuous groups.

An archaic term for calculus.

A geometric figure which touches only the sides (or interior) of another figure.