Question
Prove that the following arguments are standard by constructing metaphorical proof
$(R\ \rightarrow\ S)\ \&\ (A\ v\ C)$
$B\ \&\ (P\ \rightarrow\ W)$
$(W\ \rightarrow\ T)\ \&\ (S\ \rightarrow\ Y)$
$P\ v\ R$
$T\ v\ Y$

Answer

$(1)\ (R\  \rightarrow\ S)\ \&\ (A\ v\ C)$ $P$
$(2)\ B\ \&\ (P\  \rightarrow\ W)$ $P$
$(3)\ (W\  \rightarrow\ T)\ \&\ (S\  \rightarrow\ Y)$ $P$
$(4)\ P\ v\ R$ $P/ T\ v\ Y$
$(5)\ R\  \rightarrow\ S$ $1,$ Simp.
$(6)\ P\  \rightarrow\ W$ $2,$ Simp.
$(7)\ W\  \rightarrow\ T$ $3,$ Simp.
$(8)\ S\  \rightarrow\ Y$ $3,$ Simp.
$(9)\ W\ v\ S$ $6, 5, 4, CD$
$(10)\ T\ v\ Y$ $7, 8, 9, CD$

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