Question
Prove that the following arguments are standard by constructing metaphorical proof
$A \rightarrow B$
$C \rightarrow D$
$(\sim\ B\ \&\ P)\ \&\ (A\ v\ C)$
$(D\ v\ Z)\ \&\ \sim B$

Answer

$(1)\ A \rightarrow B$ $P$
$(2)\ C \rightarrow D$ $P$
$(3)\ (\sim B\ \&\ P)\ \&\ (A\ v\ C)$ $P/ (D\ v\ Z)\ \&\ \sim B$
$(4)\ A\ v\ C$ $3,$ Simp.
$(5)\ B\ v\ D$ $1, 2, 4, CD$
$(6)\ \sim B\ \&\ P$ $3,$ Simp.
$(7)\ \sim B$ $6,$ Simp.
$(8)\ D$ $5, 7, DS$
$(9)\ D\ v\ Z$ $8,$ Add.
$(10)\ (D\ v\ Z)\ \&\ \sim B$ $9, 7,$ Conj.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions