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24 Nov 2004, 23:40
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X is necessary for Y to happen
Z is sufficient for Y to happen
Can we conclude
1-- If Y happens X happened
2-- IF Y did not happen X did not happen
3-- If Y happened Z happened
4-- If Y did not happen, Z did not happen
Could someone explain ?
Z is sufficient for Y to happen
Can we conclude
1-- If Y happens X happened
2-- IF Y did not happen X did not happen
3-- If Y happened Z happened
4-- If Y did not happen, Z did not happen
Could someone explain ?
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25 Nov 2004, 01:28
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taklu
I think its 1. Since X has to happen for Y to happen, we can say tha if Y happens, then X happened.
2--- it might be that X happened, but Y didnt happen. Its not said that if X happens, then Y has to happen.
3-- Its not mentioned that if Z happened, then Y also happened. Instead it given that X must happen for Y to happen.
4.. it might be that Z happened, but Y did not.
Not very sure though..
25 Nov 2004, 02:08
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I think it is 1 too.
1- True, Since X is necessary for Y, if Y happened it is because X happened before.
2- It doesn’t say that if X happens, then Y will necessarily happens. Y can happen or not when X happens.
3- If Y happens, Z could have happened or not. Z is not a condition.
4- Similar to statement 2: if Y does not happen, Z could have happed or not.
1- True, Since X is necessary for Y, if Y happened it is because X happened before.
2- It doesn’t say that if X happens, then Y will necessarily happens. Y can happen or not when X happens.
3- If Y happens, Z could have happened or not. Z is not a condition.
4- Similar to statement 2: if Y does not happen, Z could have happed or not.
