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Reference.org
Conway triangle notation
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<p>In <a href="/facts/Geometry/wTQf5ffQ">geometry</a>, the Conway triangle notation, named after English mathematician <a href="/facts/John_Horton_Conway/g3PA1zoK">John Horton Conway</a>, allows <a href="/facts/Trigonometric_functions/czej7ur0">trigonometric functions</a> of a <a href="/facts/Triangle/cRXUwsMn">triangle</a> to be managed algebraically. However, though the notation was promoted by Conway, a much earlier reference to the notation goes back to the Spanish nineteenth century mathematician gl:Juan Jacobo Durán Loriga. </p>