Things which are equal to the same thing are also equal to one another.
Father of geometry
Common Notion 1, from 'Elements'
c. 300 BCE
Found in 3 providers: grok,deepseek,gemini
Cross Reference
3 sources
"What has been affirmed without proof can also be denied without proof."
Strange & Unusual"In any right-angled triangle, the square on the side subtending the right angle is equal to the squares on the sides containing the right angle."
Strange & Unusual"A number is a multitude composed of units."
Strange & Unusual"The properties of figures are derived from their definitions and postulates."
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