An matématik, logaritm-an di baz b di roun nonm réyèl strikman pozitif sa pwisans-a à lakèl i fo élvé baz-a b pou obténi sa nonm.
Pa lègzanp, logaritm-an di 1000 an baz 10 sa 3, pas 1000 = 10×10×10 = 103. Logaritm-an di x an baz b sa noté logb(x). Ensi log10(1000) = 3.
John Napier té dévlopé logaritm-yan o koumansman di xviie syèk. Pannan trwa syèk, tabl-ya di logaritm ké règ-ya pou kalkil té itilizé pou réyalizé dé kalkil, jouk yé ranplasman, à finisman-an di xxe syèk, pa dé kalkilatris.
Trwa logaritm sa roumarkab :
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