Question
Prove that the following arguments are standard by constructing metaphorical proof
$A \rightarrow B$
$C \rightarrow B$
$(\sim\ A\ \&\ \sim \ C)\  \rightarrow\  (D\  \rightarrow\ E)$
$(E\  \rightarrow\ G)\ \&\ (D\ v\ E)$
$E\ v\ G$

Answer

$(1)\ A\  \rightarrow\ B$ $P$
$(2)\ C\  \rightarrow\ B$ $P$
$(3)\ (\sim\ A\ \&\ \sim\ C)\  \rightarrow\ (D\  \rightarrow\ E)$ $P$
$(4)\ (E\  \rightarrow\ G)\ \&\ (D\ v\ E)$ $P$
$(5)\ \sim\ B$ $P/ E\ v\ G$
$(6)\ \sim\ A$ $1, 5, MT$
$(7)\ \sim\ C$ $2, 5, MT$
$(8)\ \sim\  A\ \&\ \sim\ C$ $6, 7,$ Conj.
$(9)\ D\  \rightarrow\  E$ $3, 8, MP$
$(10)\ E\  \rightarrow\  G$ $4,$ Simp.
$(11)\ D\ v\ E$ $4,$ Simp.
$(12)\ E\ v\ G$ $9, 10, 11, CD$

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