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Logic sort of question, Help is greatly appreciated!

poojapatel9494poojapatel9494 Alum Member
in General 8 karma
I have a question about a certain topic I'm getting confused with. Basically For example - If H goes to Y, then G will go to X. Does that mean that if G goes to Y, H can't go to X?

I understand the contrastive concept is A -> B --- /B -> /A but is that all to it?

I feel as if I'm missing some major concept or lesson?
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  • runiggyrunruniggyrun Alum Inactive Sage Inactive ⭐
    edited January 2016 2481 karma
    The contrapositive of "if H goes to Y then G will go to X" would be "if G doesn't go to X, then H doesn't go to Y".
    If this is a game setup where they tell you "G goes to Y", and there's only one G, then you know that G doesn't go to X, which triggers the contrapositive above (H doesn't go to Y).
    That's actually one of the inferences that can sometimes be tricky to "see", because they are not telling you "G doesn't go to X", they are telling you it's going somewhere else, and you have to figure out that the contrapositive gets triggered
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