Euclid — "What has been affirmed without proof can also be denied without proof."
What has been affirmed without proof can also be denied without proof.
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More from Euclid
"A straight line is a line which lies evenly with the points on itself."
"A ratio is a sort of relation in respect of size between two magnitudes of the same kind."
"To produce a finite straight line continuously in a straight line."
"If equals be added to equals, the wholes are equal."
"An acute angle is an angle less than a right angle."