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"What has been affirmed without proof can also be denied without proof."


Euclid is known as the “father of geometry”. He was the best known and most prominent mathematician of antiquity best known for his treatise on mathematics “The Elements”. Euclid taught and produced his works in Alexandria during the reign of Ptolemy I (323–283 BC). Euclid’s “Elements” is easily the most influential works in the history of mathematics, Up until the early 20th century it was the main textbook for teaching mathematics and geometry in most of the world. In the Elements, Euclid deduced the theorems of what is now called Euclidean geometry from a small set of axioms.

Little is known of Euclid’s life except that he taught in Alexandria. He was likely born c. 325 BC, although the place and circumstances of both his birth and death are unknown.

What is Euclid known for? 

Euclid’s The Elements are said to be “the most studied books apart from the Bible”. They comprise of 13 books:

  • Books 1-6 deal with plane geometry
  • Books 7-9 deal with number theory
  • Book 10 deals with Eudoxus’s theory of irrational numbers
  • Books 11-13 deal with solid geometry

A common misconception is that Euclid invented all concepts of geometry. This is certainly not so, as he really only pulled together ideas and developed them as his own within a textbook. However, he definitely developed the discipline of geometry making it a concrete, organized study that people could learn from by following his written work.

Other than his work in geometry for which he’s famous for, Euclid is also famous for his theories in Optiks. Euclid is considered the “Father of Geometry” since he paved the way for so many future thinkers to expand upon his organized ideas.

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