Question
Determine the validity of the following arguments using the direct method of truth table:
$A \leftrightarrow B$
$\therefore B \rightarrow A$
$A \leftrightarrow B$
$\therefore B \rightarrow A$
| Support Statement | The resulting statement | |||
| $1$ | $2$ | $3$ | $4$ | |
| $A$ | $B$ | $A \leftrightarrow B$ | $B \rightarrow A$ | |
| $1$ | $T$ | $T$ | $T^*$ | $T^*$ |
| $2$ | $T$ | $F$ | $F$ | $T$ |
| $3$ | $F$ | $T$ | $F$ | $F$ |
| $4$ | $F$ | $F$ | $T^*$ | $T^*$ |
| $1, 2(\leftrightarrow)$ | $2, 1(\rightarrow)$ | |||
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| $(P \rightarrow Q)\ \&\ (R \rightarrow S)$ |
| $(Q \rightarrow T)\ \&\ (P\ v\ R)$ |
| $\sim T$ |
| $(T\ v\ S)\ \&\ \sim T$ |
| $A \rightarrow B$ |
| $B \rightarrow S$ |
| $A\ \&\ T$ |
| $\therefore S\ \&\ T$ |
| $A\ \rightarrow\ B$ |
| $(R\ \&\ D)\ v\ A$ |
| $T\ v\ [(R\ \&\ D)\ \rightarrow\ W]$ |
| $D\ \&\ \sim\ T$ |
| $\therefore\ [D\ \&\ (W\ v\ B)])\ v\ \sim\ A$ |
| $(A\ v\ B)\ \rightarrow [D\ \rightarrow\ (P\ \&\ \sim \ Q)]$ |
| $(A\ \&\ J) \rightarrow [(P\ \&\ \sim\ Q)\ \rightarrow\ K]$ |
| $(A\ \&\ J)\ \&\ (\sim\ K\ v\ D)$ |
| $\therefore (D\rightarrow K)\ v\ \sim\ Q$ |
| $(P\ v\ R)\ \rightarrow (S\ v\ T)$ |
| $\sim M\ \&\ \sim N$ |
| $N\ v \sim (S\ v\ T)$ |
| $H \rightarrow (P\ v\ R)$ |
| $[\sim H\ \&\ \sim (P\ v\ R)]\ v\ S$ |