J.C 發問於 文學及人文學哲學 · 1 十年前

Critical thinking,short table

Can anyone please determine me the following argument is valid or not in SHORT TRUTH TABLE method (indirect truth table method) of critical thinking?

1. (A v B) -> ( C & D )

2. ( X v Y ) -> ( ~C & ~W)

3. ( X v Z ) -> ( A & E )

Therefore, ~X

If the argument is invalid, please also indicate truth values of the simple propositions that demonstrate the invalidity.

VERY URGENT!!!! 15 POINTS!!! THANKS

1 個解答

評分
  • 1 十年前
    最愛解答

    Suppose AvB→CΛD/ XvY→~CΛ~W/ XvZ→AΛE / ~X

    T T T FT

    So AvB→CΛD/ XvY→~CΛ~W/ XvZ→AΛE / ~X

    TF T TFF /TT T TF T TF / TT T TTT/ FT

    Contradiction. The argument is valid.

    2010-04-14 19:56:13 補充:

    咁難得度住位黎寫,最後一Submit都係移哂位添。。。你自己試下就番黎睇

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