Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ ¹ ² ³ °
 

You are not logged in. #2 20130526 23:51:37
Re: What is this?In book 3 of the Elements, Euclid treats it as a postulate (definition).
Bob You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei 