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A 10000-sided polygon.

One of the two pieces of a double cone (i.e., two cones placed apex to apex).

The simplicial complex formed from a family of objects by taking sets that have nonempty intersections.

Approximates the possible values of y in terms of x if sum_(i,j=0)^na_(ij)x^iy^j=0.

An algebraic surface of degree 9. Enneper's minimal surface is an example of a nonic surface.

A quantity that is nonzero everywhere is said to be nonvanishing. For instance, the values of x^2+1 are nonvanishing for real x, while those of x^2 are not (since x^2 ...

A vector space possessing a norm.

A function f:A->B such that B is a set of numbers.

An angle which is not a right angle or a multiple of a right angle.

An 80-sided polygon.