Does the negation of 'and' become 'or'? Organizing 'negation of conditions' in Math I with an idol

In 'Sets and Propositions' of Math I, a topic that is subtly easy to get wrong is the 'negation of conditions'.For example,x ...
umass

Speaker Series: Zeynep Soysal (University of Rochester)

Abstract: In this talk I will defend the metalinguistic solution to the problem of mathematical omniscience for the possible-worlds account of propositions. The metalinguistic solution says that ...