# Euclid's Elements' by Euclid (c. 300 BCE)

Euclid's Elements' by Euclid (c. 300 BCE)

Euclid's Elements is one of the most influential works in the history of mathematics, written by the ancient Greek mathematician Euclid.

It is a collection of 13 books, containing the first known systematic discussion of geometry, based on axioms and theorems.

The content of Elements includes definitions, postulates, propositions, and proofs of theorems.

Euclid's definition of a point is "that which has no part" and his definition of a line is "breadthless length".

Euclid's five postulates, known as the "parallel postulate", have been the basis for much of geometry since the time of Euclid.

The propositions are the main sections of the work and provide the proofs of the theorems.

The theorems include the Pythagorean theorem, theorems on the properties of circles, and the law of cosines.

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