For example, Dedekind was the first to prove Fermat's two-square theorem using the unique factorization of Gaussian integers.
Dǎɣ olahan, Dedekind eqalan wa dazaran asikna tabarat ən əsin sisigdihan ən Fermat dǎɣ amitkil ən fanaz iyandǎɣ dǎɣ wəmdanen ən Eisenstein.