The Book of Lemmas is a book attributed to Archimedes by Thābit ibn Qurra, though the authorship of the book is questionable. It consists of fifteen propositions on circles.
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“When two are of one mind, their strength can cut gold.”
—Chinese proverb.
I-ching (Book of Changes)
“We have left undone those things which we ought to have done; and we have done those things which we ought not to have done.”
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