"In matters connected with geometry, nothing is to be taken upon trust: mere opinion, unsupported by reasonings which elevate it into proof, must be regarded, in this subject, as of but little worth."
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John Radford Young, "Proportion. A Treatise intended as a Substitute for Euclid's Book V," in The mathematical sciences (1860)
https://en.wikiquote.org/wiki/Doctrine_of_proportion_(mathematics)
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Doctrine of proportion (mathematics)
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