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A function for which the integral can be computed is said to be integrable.

Given a geodesic triangle (a triangle formed by the arcs of three geodesics on a smooth surface), int_(ABC)Kda=A+B+C-pi. Given the Euler characteristic chi, intintKda=2pichi, ...

A method for constructing magic squares of singly even order n>=6.

The Lebesgue identity is the algebraic identity (Nagell 1951, pp. 194-195).

The portion of the complex plane z=x+iy with real part R[z]<0.

A limb of a tree at a vertex v is the union of one or more branches at v in the tree. v is then called the base of the limb.

A simplicial complex K is said to be locally finite if each vertex of K belongs only to finitely many simplices of K.

The unit lower half-disk is the portion of the complex plane satisfying {|z|<=1,I[z]<0}.

The portion of the complex plane {x+iy:x,y in (-infty,infty)} satisfying y=I[z]<0, i.e., {x+iy:x in (-infty,infty),y in (-infty,0)}

A method for constructing magic squares of odd order.