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In music, a perfect fifth is the interval between two notes whose frequencies are in 3:2 ratio. For example, the interval from an A at 440 Hz and an E at 660 Hz is a perfect fifth. Going up by 12 perfect fifths is very nearly the same as going up 7 octaves. That is, […] The post Perfect fifths, octaves, and an ergodic map first appeared on John D. Cook....