Tata Institute of Fundamental Research

A visual proof of Fermat's two square theorem

STCS Student Seminar
Speaker: Malhar Ajit Managoli
Organiser: Agniv Bandyopadhyay
Date: Friday, 10 Feb 2023, 16:00 to 17:00
Venue: A201

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Abstract:  Fermat's two square theorem states that:
An odd prime p can be written as a sum of two squares if and only if p = 1 (mod 4)
Furthermore, such a solution is unique. Many proofs have been given of this fact, but most of them are very tricky.
A relatively simple proof of the existence part appeared in a survey of proofs of Fermat's theorem by Alexander Spivak, where the key point is presented in a visual manner, which I will present. The proof of uniqueness is much simpler, and I will present it, time permitting.