Logs, the number line..........
The natural logarithm of a number is its logarithm to the base e, where e is an irrational and transcendental constant approximately equal to 2.718281828459. The natural logarithm of x is generally written as ln x, loge x , or sometimes, if the base e is implicit, logsimply x.[1] Parentheses are sometimes added for clarity, giving ln ( x), loge(x) or log( x). This is done in particular when the argument to the logarithm is not a single symbol, to prevent ambiguity.
The natural logarithm of x is the power to which e would have to be raised to equal x. For example, ln ( 7.5) is 2.0149..., ebecause 2.0149... = 7.5. The natural log of e itself, ln ( e), is 1, because e 1 = e, while the natural logarithm of 1, ln ( 1), is 0, since e 0 = 1.
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