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A pole of multiplicity less than p+1.

External (or positive) and internal (or negative) similarity points of two circles with centers C and C^' and radii r and r^' are the points E and I on the lines CC^' such ...

The sequence of six 9s which begins at the 762nd decimal place of pi, pi=3.14159...134999999_()_(six 9s)837... (Wells 1986, p. 51). The positions of the first occurrences of ...

A pair of closed form functions (F,G) is said to be a Wilf-Zeilberger pair if F(n+1,k)-F(n,k)=G(n,k+1)-G(n,k). (1) The Wilf-Zeilberger formalism provides succinct proofs of ...

A method for computing an Egyptian fraction. This method always terminates (Beeckmans 1993).

Given a set S of points in the plane, an enclosing circle is a circle for which all points S lie in its interior.

In any triangle, if one of the sides is extended, the exterior angle is greater than both the interior and opposite angles.

A polyhedron compound in which the great dodecahedron is interior to its dual small stellated dodecahedron.

To generate random points over the unit disk, it is incorrect to use two uniformly distributed variables r in [0,1] and theta in [0,2pi) and then take x = rcostheta (1) y = ...

Is there a planar convex set having two distinct equichordal points? The problem was first proposed by Fujiwara (1916) and Blaschke et al. (1917), but long defied solution. ...