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

Answer

$(1)\ (A\ v\ B)\ v\ \sim\ C$ $P$
$(2)\ D\  \rightarrow\  [(A\ v\ B)\  \rightarrow\ E]$ $P$
$(3)\ F\  \rightarrow\  (\sim\ C\  \rightarrow\ G)$ $P$
$(4)\ D\ \&\ F$ $P/ (E\ v\ G)\ v\ H$
$(5)\ D$ $4,$ Simp.
$(6)\ (A\ v\ B)\  \rightarrow\ E$ $2, 5, MP$
$(7)\ F$ $4,$ Simp.
$(8)\ \sim\ C\  \rightarrow\  G$ $3, 7, MP$
$(9)\ E\ v\ G$ $6, 8, 1, CD$
$(10)\ (E\ v\ G)\ v\ H$ $9,$ Add.

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