What has been affirmed without proof can also be denied without proof.Euclid
“Things which are equal to the same thing are also equal to one another.”
“Things which are equal to the same thing are also equal to one another.”
— EUCLID
Mathematician
Euclid was a Greek mathematician active in Alexandria around 300 BCE, often called the father of geometry. His Elements, a systematic treatment of geometry and number theory in thirteen books, remained the standard mathematical textbook for more than two thousand years.
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