Neper soni
Neper soni (esoni) – (l + i)” ifodaning p cheksizga intiladigan limita, e = lim(l + i)” =2,718281828459045…, natural logarifmning asosi. Sh. Ermit (1873) Neper soni transtsendent son ekanligini isbotlagan. Neper soni J. Neper nomiga qo’yilgan.