Things which coincide with one another are equal to one another.
Father of geometry
Common Notion 4, from 'Elements'
c. 300 BCE
Found in 3 providers: grok,deepseek,gemini
Cross Reference
3 sources
"To construct an equilateral triangle on a given finite straight line."
Strange & Unusual"No trace of Euclid's personality has survived."
Shocking"There are infinitely many prime numbers."
Strange & Unusual"To construct a square on a given straight line."
Strange & Unusual"A plane angle is the inclination to one another of two lines in a plane which meet one another and do not lie in a straight line."
Strange & Unusual