Question
Prove that the following arguments are standard by constructing metaphorical proof
$T \rightarrow W$
$X \rightarrow Y$
$Z \rightarrow W$
$X \rightarrow A$
$W \rightarrow X$
$[(T \rightarrow  Y)\ \&\ (Z \rightarrow A)] \rightarrow  (T\ v\ Z)$

Answer

$(1)\ T \rightarrow W$ $P$
$(2)\ X \rightarrow Y$ $P$
$(3)\ Z \rightarrow W$ $P$
$(4)\ X \rightarrow A$ $P$
$(5)\ W \rightarrow X$ $P$
$(6)\ [(T \rightarrow Y)\ \&\ (Z \rightarrow  A)] \rightarrow  (T\ v\ Z)$ $P/ T\ v\ Z$
$(7)\ T \rightarrow X$ $1, 5 HS$
$(8)\ T \rightarrow Y$ $7, 2, HS$
$(9)\ Z \rightarrow  X$ $3, 5, HS$
$(10)\ Z \rightarrow A$ $9, 4, HS$
$(11)\ (T \rightarrow Y)\ \&\ (Z \rightarrow  A)$ $8, 10,$ Conj.
$(12)\ T\ v\ Z$ $6, 11, MP$

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