Feb 25, 2013 · In the ALGOL 58 specification, Backus did not originally use the vertical line; He used the word "or" with a line over it (as well as the logic symbol ). Peter Naur, a Danish …

The upside-down A symbol is the universal quantifier from predicate logic. (Also see the more complete discussion of the first-order predicate calculus .) As others noted, it means that the …

Aug 22, 2015 · People are saying that the symbol doesn't mean addition. This is true, but doesn't explain why a plus-like symbol is used for something that isn't addition. The answer is that for …

Oct 14, 2012 · The role of symbol resolution is to link these two "x": for example, it would be a good idea for the "x" identifier used in the expression "x+42" to point to its assumed definition. …

Mar 20, 2017 · (assuming that you talk about propositional logic (it is similar for other logics such as pred. logic)) for two formulas A and B: A |= B "B evaluates to true under all evaluations that …

Apr 15, 2010 · Hmm.. well I know about XOR (exclusive or) and NAND and NOR. These are logic gates and have their software analogs. Essentially they behave like so: XOR is true only when …

@einpoklum Pure speculation, but I'd bet on no. Even if the compiled could ensure that the bool values are indeed a 0 or 1 (or whatever the system uses), which should be possible because …

Mar 21, 2010 · Say you want to build Logic Gates in Python: def AND(a,b): return (a and b) #using and operator def OR(a,b): return (a or b) #using or operator Now try calling them: print …

Feb 10, 2012 · It's a very silly example, but I hope it shows how to read this. I've made the ⊢ bold to show it is the "top-level" thing in the line, separating the assumptions from the conclusion. …

Re your edit, the problem is that both sides of your || operator aren't true or false ("boolean") expressions. . Your stateme