Question
Prove that the following arguments are standard by constructing metaphorical proof
$G \rightarrow J$
$J \rightarrow K$
$(G \rightarrow K) v (J \rightarrow L)$
$L \rightarrow M$
$\therefore (J \rightarrow M) v\ Q$

Answer

$(1)\ G\ \rightarrow\ J$ $P$
$(2)\ J\ \rightarrow\ K$ $P$
$(3)\ (G \rightarrow K) \rightarrow (J \rightarrow L)$ $P$
$(4)\ L \rightarrow M$ $P/\therefore (J \rightarrow \ M)\ v\ Q$
$(5)\ G \rightarrow K$ $1, 2, HS$
$(6)\ J \rightarrow L$ $3, 5, MP$
$(7)\ J\rightarrow M$ $6, 4, HS$
$(8)\ (J \rightarrow M)\ v\ Q$ $7,$ Add.

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