This theorem was conjectured in the 18th century, but it was not proved until 1896, when Hadamard and (independently) Charles de la Vallée Poussin, used complex analysis.
Teorama conjectured na ito ay sa ika-18 siglo, ngunit ito ay hindi proved hanggang 1896, at kapag Hadamard (malaya) Charles de la Vallee Poussin, ginamit na mga komplikadong pagtatasa.