**Sophie Germain** was a French mathematician physicist and philosopher.

She was born on the 1 April 1776 at Paris and she died when she was 55 years old on the 27 June 1831 at Paris too .

Sophie Germain was the first and only woman who** demonstrated Fermat’s Last Theorem** or number theory.

**WHAT SHE DID ???**

There aren’t invalid integers x , and z such as : ** x ^{n} + y^{n} = z^{n}** as soon as n is an integer strictly upper to 2.

In case **n = 1**, the equation x^{n} + y^{n} = z^{n} corresponds to the usual addition.

In case **n = 2**, this equation has another infinity of not invalid solutions, the smallest of which is **(3, 4, 5)** : **3 ^{2} + 4^{2 }= 5^{2}**

See also ** Fermat’s Last Theorem**

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