A mathematical rule stating that if two ratios are equal, then the ratio of the sum of the antecedents to the sum of the consequents equals each original ratio.
From Latin 'componendo' (ablative form of 'componendus,' meaning 'by compounding' or 'by putting together'). This is a mathematical term that preserves its Latin form in English mathematical contexts.
Mathematical terminology often retains Latin and Greek in their original forms because mathematics is a universal language where 'componendo' means the same thing in English, French, Spanish, or Mandarin—the Latin keeps it precise and unchanging.
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