Back إثبات أن عدد أويلر غير كسري Arabic Demostració que e és irracional Catalan Beweis der Irrationalität der eulerschen Zahl German Demostración de la irracionalidad de e Spanish Az e irracionálisságának bizonyítása Hungarian Bukti bahwa e irasional ID Dimostrazione della irrazionalità di e Italian ネイピア数の無理性の証明 Japanese Irazziunalitaa dal nümer e LMO Prova de que e é irracional Portuguese
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The number e was introduced by Jacob Bernoulli in 1683. More than half a century later, Euler, who had been a student of Jacob's younger brother Johann, proved that e is irrational; that is, that it cannot be expressed as the quotient of two integers.