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noun, Mathematics.
a logarithm having e as a base. Symbol: ln.
a logarithm to the base e. Usually written loge or ln Also called Napierian logarithm Compare e (sense 1), common logarithm
natural logarithm
A logarithm using base e. Natural logarithms are common in mathematics, especially in cases involving complex numbers. They are also called Napierian logarithms, after their inventor, English mathematician John Napier (1550-1617). See more at e. Compare common logarithm.


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