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The sum of sets A and B in a vector space, equal to {a+b:a in A,b in B}.

Calculus of variations can be used to find the curve from a point (x_1,y_1) to a point (x_2,y_2) which, when revolved around the x-axis, yields a surface of smallest surface ...

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

The solid angle Omega subtended by a surface S is defined as the surface area Omega of a unit sphere covered by the surface's projection onto the sphere. This can be written ...

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.