Well, both the Wolfram MathWorld and the EMS prefers log_e = ln, and log = log_10: https://mathworld.wolfram.com/Logarithm.html https://mathworld.wolfram.com/L

Well, both the Wolfram MathWorld and the EMS prefers log_e = ln, and log = log_10: https://mathworld.wolfram.com/Logarithm.html https://mathworld.wolfram.com/Logarithm.html https://mathworld.wolfram.com/CommonLogarithm.html https://mathworld.wolfram.com/CommonLogarithm.html https://encyclopediaofmath.org/wiki/Logarithmic_function https://encyclopediaofmath.org/wiki/Logarithmic_function https://encyclopediaofmath.org/wiki/Logarithm_of_a_number https://encyclopediaofmath.org/wiki/Logarithm_of_a_number . Also me, and the other commenter below learned "ln" for the natural logarithm, and used "log" only for binary/decimal logarithm. I am starting to think that log = log_e is actually the minority usage, but it is certainly not universal.