More on and or
TL;DR: applying Boolean logic to linguistics is an exercise in futility.
Another commenter points out something I had missed:
Also, “/” does not just mean logical AND. Two counterexamples: “his/her”, “male/female”. In these cases, as with “and/or”, it means logical XOR. Applying that to “and/or”, you have (A AND B) XOR (A XOR B) = A OR B.