In mathematics, describing a configuration where four collinear points have equal harmonic relationships or ratios.
From Latin 'aequi-' (equal) plus 'anharmonic' (relating to harmonic division in mathematics). A highly specialized term from projective geometry and algebraic mathematics.
This term comes from harmonic division—a concept that's been mind-blowing mathematicians since ancient Greece because it appears in music, art, and optics all at once, like nature uses the same mathematical recipe everywhere!
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