For example, below the second sentence is possible correct as the logic operator OR covers all cases. Is the 3rd version the correct?
For example in a room are musicians and somebody asks: "Please come forward those who play flute and piano" 2 musicians only come. If the proposal is: "Please come forward those who play piano or flute", 7 musicians come. Those 2 who play both, those who play the piano only, those who play the flute only.
I was very lucky to learn this by my teacher of Mathematics Babis Pantazatos. He would thoroughly explain the Aristotelian Symbolic Logic, logic, operators, truthy tables, set theory. On few books such as the book of BBC producer Alec Nisbet on microphones the OR operator is used.
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