(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

I've been going through a book called "Short Calculus: The Original Edition of A First Course in Calculus," by Serge Lang. It says, " The derivative of a^x is a^x (log a)." But everything else I look at says the derivative of a^x is a^x (ln a). Since ln a and log a are different numbers, I don't see how both equations could be true. And, in fact, the Lang book never mentions ln at all!

The Lang book was 1st published in 1964 (although this is a 2002 printing). Could that be the explanation?

2. Relevant equations

3. The attempt at a solution

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# Homework Help: Ln vs. log in Short Calculus book by Serge Lang

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