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The point of coincidence of P and P^' in Fagnano's theorem.

Draw lines P_AQ_A, P_BQ_B, and P_CQ_C through the symmedian point K and parallel to the sides of the triangle DeltaABC. The points where the parallel lines intersect the ...

When referring to a planar object, "fixed" means that the object is regarded as fixed in the plane so that it may not be picked up and flipped. As a result, mirror images are ...

A map x|->x^p where p is a prime.

The geodesics on a general cylinder generated by lines parallel to a line l with which the tangent makes a constant angle.

dtau^2=-eta_(alphabeta)dxi^alphadxi^beta, or (d^2xi^alpha)/(dtau^2)=0.

The goat problem (or bull-tethering problem) considers a fenced circular field of radius a with a goat (or bull, or other animal) tied to a point on the interior or exterior ...

Objects which are identical except for a mirror reflection are said to display handedness and to be chiral.

The locus of a point which is derived from a fixed point Q by continuous parallel displacement.

A curve created by starting with a circle, dividing it into six arcs, and flipping three alternating arcs. The process is then repeated an infinite number of times.