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A Riemann surface is a surface-like configuration that covers the complex plane with several, and in general infinitely many, "sheets." These sheets can have very complicated ...

A line that simultaneously bisects a triangle's perimeter and area.

The function Pi_(a,b)(x)=H(x-a)-H(x-b) which is equal to 1 for a<=x<=b and 0 otherwise. Here H(x) is the Heaviside step function. The special case Pi_(-1/2,1/2)(x) gives the ...

The area of the shadow of a body on a plane, also called the "outer quermass."

If, in two solids of equal altitude, the sections made by planes parallel to and at the same distance from their respective bases are always equal, then the volumes of the ...

Two quantities a and b which are not equal are said to be unequal, and this relationship can be denoted a!=b.

While an equality A=B states that two mathematical expressions are equal, an inequation A!=B states that two expressions are not equal.

A fixed point for which the stability matrix has equal nonzero eigenvectors.

The relationship x precedes y is written x≺y. The relation x precedes or is equal to y is written x<=y.

A parallelogram is a quadrilateral with opposite sides parallel (and therefore opposite angles equal). A quadrilateral with equal sides is called a rhombus, and a ...