Easy question

[jte]

(09-06-2021 12:41 PM)ijabbott Wrote:  ⋮
The Xcas documentation doesn’t seem to describe the precedence of operators in the Giac/Xcas language, but all the boolean operators are described in the same section, so I guess ‘and’, ‘or’, and ‘xor’ are evaluated at the same precedence in left-to-right order.
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Seems like a reasonable guess! When I just mentioned the “T ∨ F ∧ F“ to my daughter, she suggested another possibility: perhaps OR is higher precedence than AND in the CAS.

So, as an experiment, I tried flipping the expression around and tried “False AND False OR True” in CAS view. “True” is the result. Not a bad illustration of some of the benefits of precedence rules — that, with associative and commutative operations like AND and OR, one may rearrange arguments to the higher precedence operation or to the lower precedence operation (without changing the final result).

Since I mentioned trying the evaluation in Python, I thought I’d also try it using Python syntax in the CAS. There, “True or False and False” evaluates to “False”.