Is "If A then B" equal to "B if and only if A"? - eviltoast
    • BananaTrifleViolin@kbin.social
      81·
      10 months ago

      Actually a good example:

      • If you have AIDs (A) then you have HIV (B). True
      • You have HIV (B) if, and only if, you have AIDS (A). Not true
      • If you don’t have HIV (B), then you don’t have AIDs (A). True, and the actual inverse of “If A then B”; which is “If not B, then not A”