Euclid (/ˈjuːklɪd/; Greek: Εὐκλείδης Eukleidēs; fl. - TopicsExpress

Euclid (/ˈjuːklɪd/; Greek: Εὐκλείδης Eukleidēs; fl. 300 BC), also known as Euclid of Alexandria, was a Greek mathematician, often referred to as the Father of Geometry. Euclid was one of the first great Greek mathematicians. In his classic Elements, Euclid laid the framework for our formal understanding of geometry. While earlier Greek philosophers like the Pythagoreans investigated a number of mathematical problems, Euclid introduced the idea of rigorous proof: Starting with a handful of assumed axioms about the basic nature of points, lines, circles, and angles, Euclid builds up ever more complicated ideas in geometry by using pure deductive logic to combine insights from previous results to understand new ideas. This process of using rigorous proof to build new results out of existing results introduced in the Elements has remained perhaps the most central guiding principle of mathematics for over two millennia.