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| set of ordered pairs |
| product of a given integer and all smaller positive integers |
| natural logarithm | |
| —n | |
| e Compare common logarithm Also called: Napierian logarithm a logarithm to the base e. Usually written loge or ln | |
| 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. |