单词	Perfect Proportion
释义	Perfect Proportion Since (1) it follows that (2) so (3) where and are the Arithmetic Mean and Harmonic Mean of and . This relationship was purportedly discovered by Pythagoras. See also Arithmetic Mean, Harmonic Mean
随便看	Doughnut Douglas-Neumann Theorem Dovetailing Problem Dowker Notation Down Arrow Notation Dozen Dragon Curve Dragon Fractal Draughts Drinfeld's Symmetric Space Droz-Farny Circles Drum D-Statistic D-Triangle Dual Basis Dual Bivector Dual Graph Duality Principle Duality Theorem Dual Map Dual Polyhedron Dual Scalar Dual Solid Dual Tensor Dual Voting

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