Question
Prove that the following arguments are standard by constructing metaphorical proof
$T \rightarrow B$
$B \rightarrow ( \sim\ P \rightarrow\ \sim\ Q)$
$\sim\ P\ \&\ \sim\ R$
$T$
$\therefore\sim\ Q\ v\ X$

Answer

$(1)\ T\  \rightarrow\ B$ $P$
$(2)\ B\  \rightarrow\ (\sim\ P\  \rightarrow\  \sim\ Q)$ $P$
$(3)\ \sim\ P\ \&\ \sim\ R$ $P$
$(4)\ T$ $P/ \therefore\  \sim\ Q\ v\ X$
$(5)\ B$ $1, 4, MP$
$(6)\ \sim\ P\  \rightarrow\ \sim\ Q$ $2, 5, MP$
$(7)\ \sim\ P$ $3,$ Simp.
$(8)\ \sim\ Q$ $6, 7, MP$
$(9)\ \sim\ Q\ v\ X$ $8,$ Add.

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