Euler was Swiss and spoke French, so he might have called the function "le Logarithme Naturel", rather than "the natural log", in which case, "ln" makes sense. However, history shows that Euler actually used just "l(x)" for the logarithm using "his" number e as its base.
So, what is M and M+ on a calculator?
Old or simple calculators have a memory register - essentially a second calculator that can handle addition/subtraction only. M+, M-: Add (or subtract) the current value to (or from) the stored value in the memory register. MR : Recall the current memory register value. MC : Clear the memory register (set to zero).
What is the meaning of AC in calculator?
- All Clear. Clears the calculator, and resets any functions. The contents of the memory are not affected by AC. The memory can be cleared after pressing AC by pressing Min.
What do the MS mean on a calculator?
The ms (memory store) button copies the number from the screen to the memory. The mr (memory recall) button brings the memory value back to the screen. M+ and m- add or subtract the screen value from the memory value (hiding the result in the memory, so you need to be careful not to double-press the button).