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

A type I Markov move.

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

A topological space.

Curves which, when rotated in a square, make contact with all four sides. Such curves are sometimes also known as rollers. The "width" of a closed convex curve is defined as ...

A number of the form a_0+a_1zeta+...+a_(p-1)zeta^(p-1), where zeta=e^(2pii/p) is a de Moivre number and p is a prime number. Unique factorizations of cyclotomic integers fail ...

A series s_1,s_2,... for which s_1>=s_2>=....

One of the three 2-polyaboloes.

A metric g_(ij) which is zero for i!=j.

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