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A puzzle in which one object is to be converted to another by making a finite number of cuts and reassembling it. The cuts are often, but not always, restricted to straight ...

The eccentric angle of a point on an ellipse with semimajor axes of length a and semiminor axes of length b is the angle t in the parametrization x = acost (1) y = bsint, (2) ...

In two dimensions, the curve known as an "egg' is an oval with one end more pointed than the other.

An even Mathieu function ce_r(z,q) with characteristic value a_r.

Johnson solid J_(16).

Johnson solid J_(41).

A Jordan algebra which is not isomorphic to a subalgebra.

The Cartesian product of a finite or infinite set of modules over a ring with only finitely many nonzero entries in each sequence.

If f:E->B is a fiber bundle with B a paracompact topological space, then f satisfies the homotopy lifting property with respect to all topological spaces. In other words, if ...

The field axioms are generally written in additive and multiplicative pairs. name addition multiplication associativity (a+b)+c=a+(b+c) (ab)c=a(bc) commutativity a+b=b+a ...