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Thread: Direct Proof

  1. #1
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    Direct Proof

    the question is in the attachment and the format of the proof is in the doc. attachment
    Attached Thumbnails Attached Thumbnails Direct Proof-200931344186337147585889062502198.jpg  
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  2. #2
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    $\displaystyle \begin{array}{lcr}
    1 & {a \to b} & {} \\
    2 & {\neg c \to d} & {} \\
    3 & {\neg b \vee \neg d} & {} \\
    4 & {b \to \neg d} & 3 \\
    5 & {a \to \neg d} & {1,4} \\
    6 & {d \to \neg a} & 5 \\
    7 & {\neg c \to \neg a} & {2,6} \\
    8 & {c \vee \neg a} & 7 \\

    \end{array} $
    Now you supply the correct format and reasons.
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  3. #3
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    thanx alot that is helped

    I appreciated
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