(-) precedence

[FLISZT]

(12-10-2022 01:51 AM)mfleming Wrote:  

(12-09-2022 02:52 PM)KeithB Wrote:  I don't think that anyone has mentioned that the Prime has *both* operators. A subtraction operator and the unary minus, each with different symbols. In this case, I think the unary minus should bind tighter to the number.

I never noticed the Prime display of negative versus negation, but you are correct. Neat! The Prime negative indicator reminds me of the APL "high minus" in which a negative number uses the "¯" symbol to indicate a negative number, as in

¯2 as opposed to -2

That of course means ¯2 is negative two (not the negation of two or 0-2) and ¯2*2 (* is power of) equals 4 as expected, whereas -2*2 is ¯4 because APL expressions are evaluated right to left (no function precedence nonsense), and thus negation is applied last. The '-' symbol is subtraction with a LHS argument and negation without, so then 2--2 is 4 (obviously )

APL is a mathematical notation developed by a Mathematician. Wish I had an APL calculator

This is probably not the APL calculator you could dream of, but it may be of interest to you and/or other readers.

https://home.gwu.edu/~nbrenner/
↳ direct link: https://home.gwu.edu/~nbrenner/49GNotes.txt

BTW: on RPL calculators (28 → 50), the algebraic expression '-2^2' gives -4 as a résult.