Mathematician:Albert Girard

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Mathematician

Professional French lutenist who also studied mathematics, working in the fields of algebra, trigonometry and arithmetic.

Gave an inductive formula for the Fibonacci numbers.

First stated in $1632$ that every prime of the form $4 k + 1$ is the sum of two squares in only one way.

Invented the symbol $\sqrt[n]x$ for the $n$th root of $x$.[1]

Also introduced the symbols $\sin$, $\cos$ and $\tan$.

His work led eventually to the creation of group theory.


Nationality

French


History

  • Born: 1595 in St Mihiel, France.
  • Died: 8 Dec 1632 in Leiden, Netherlands.


Theorems

Results named for Albert Girard can be found here.


Publications

  • 1626: A treatise on trigonometry

(titles unknown)


Sources


References