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The ideal generated by a set in a vector space.

A set equipped with a sigma-algebra of subsets.

The fractal J(-3/4,0), where J is the Julia set. It slightly resembles the Mandelbrot set.

A Julia set with c=-0.390541-0.586788i. The fractal somewhat resembles the better known Mandelbrot set.

Assume that n numbered pancakes are stacked, and that a spatula can be used to reverse the order of the top k pancakes for 2<=k<=n. Then the pancake sorting problem asks how ...

Maximize the distance a Jeep can penetrate into the desert using a given quantity of fuel. The Jeep is allowed to go forward, unload some fuel, and then return to its base ...

For every partition of all the points on a line into two nonempty sets such that no point of either lies between two points of the other, there is a point of one set which ...

A set in R^d formed by translating an affine subspace or by the intersection of a set of hyperplanes.

A set A of integers is recursively isomorphic to set B if there is a bijective recursive function f such that f(A)=B.

The partial differential equation u_(xy)+(N(u_x+u_y))/(x+y)=0.