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Math Help - 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
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  2. #2
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    \begin{array}{lcr}<br />
   1 & {a \to b} & {}  \\<br />
   2 & {\neg c \to d} & {}  \\<br />
   3 & {\neg b \vee \neg d} & {}  \\<br />
   4 & {b \to \neg d} & 3  \\<br />
   5 & {a \to \neg d} & {1,4}  \\<br />
   6 & {d \to \neg a} & 5  \\<br />
   7 & {\neg c \to \neg a} & {2,6}  \\<br />
   8 & {c \vee \neg a} & 7  \\<br /> <br />
 \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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