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[[Image:Hgfru5.jpg|right|thumb|Justus van Ghent's depiction of Euclid.  No likeness or description of Euclid's physical appearance made during his lifetime survives.]]

[[Image:Hgfru5.jpg|right|thumb|Justus van Ghent's depiction of Euclid.  No likeness or description of Euclid's physical appearance made during his lifetime survives.]]

'''Euclid''' was a [[Greeks|Greek]] mathematician who lived 325-365 B.C. in [[Hellenistic]] [[Alexandria]].  He was the father of [[geometry]] and  wrote the ''[[Elements]]'' which is considered to be one of the most successful mathematics textbooks ever. Euclid's Elements focuses mainly on [[geometry]] but also has a small amount of number theory dealing with [[prime number|prime numbers]] and even [[perfect number|perfect numbers]].

'''Euclid''' was a [[Greeks|Greek]] mathematician who lived 325-365 B.C. in [[Hellenistic]] [[Alexandria]].  He was the father of [[geometry]] and  wrote the ''[[Elements]]'' which is considered to be one of the most successful mathematics textbooks ever. It is a compilation of the available geometric proofs at the time. The book is a rigorous yet easily accessible geometric treatise that is essentially the foundation of mathematics, and astronomy relied on Euclid for many years. In his book is the proof for one of the most notable results, the Pythagorean theorem. Euclid's Elements focuses mainly on [[geometry]] but also has a small amount of number theory dealing with [[prime number|prime numbers]] and even [[perfect number|perfect numbers]].

{{quotation|Euclid's ''Elements'' form one of the most beautiful and influential works of [[science]] in the history of [[humankind]]. Its beauty lies in its [[logic]]al development of geometry and other branches of mathematics. It has influenced all branches of science but none so much as mathematics and the [[exact sciences]].}}  

{{quotation|Euclid's ''Elements'' form one of the most beautiful and influential works of [[science]] in the history of [[humankind]]. Its beauty lies in its [[logic]]al development of geometry and other branches of mathematics. It has influenced all branches of science but none so much as mathematics and the [[exact sciences]].}}