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Butterfly theorem
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==History== Proving the butterfly theorem was posed as a problem by [[William Wallace (mathematician)|William Wallace]] in ''The Gentleman's Mathematical Companion'' (1803). Three solutions were published in 1804, and in 1805 [[Sir William Herschel]] posed the question again in a letter to Wallace. Reverend Thomas Scurr asked the same question again in 1814 in the ''Gentleman's Diary or Mathematical Repository''.<ref>[http://www.cut-the-knot.org/pythagoras/WallaceButterfly.shtml William Wallace's 1803 Statement of the Butterfly Theorem], [[cut-the-knot]], retrieved 2015-05-07.</ref> <br />
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