## Dirichlet, Peter Gustav Lejeune (1805–1859)x^{5} + y^{5} =
kz^{5}. His book Lectures on Number Theory (1863)
is similar in stature to Gauss's earlier Disquisitiones and founded
modern algebraic number theory.
In 1829 he gave the conditions sufficient for a Fourier
series to converge (though the conditions necessary for it to converge
are still undiscovered).## Related category• MATHEMATICIANS | ||||||

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