Distributive Law
Problem: Verify that $ (p \vee q) \wedge (p \vee r) $ is logically equivalent to $ p \vee (q \wedge r) $.
1. Approach: We prove the equivalence by showing each direction separately, and we will also explain how the given truth table matches the reasoning.
2. Proof of $ (p \vee q) \wedge (p \vee r) \implies p \vee (q \wedge r) $.
Assume $ (p \vee q) \wedge (p \vee r) $ is true.
Either $p$ is true or $p$ is false.
If $p$ is true then $p \vee (q \wedge r)$ is true.
If $p$ is false then both $p \vee q$ and $p \vee r$ must be true, so $q$ is true and $r$ is true, hence $q \wedge r$ is true, and thus $p \vee (q \wedge r)$ is true.
Therefore in all cases $ (p \vee q) \wedge (p \vee r) \implies p \vee (q \wedge r)$.
3. Proof of $ p \vee (q \wedge r) \implies (p \vee q) \wedge (p \vee r) $.
Assume $p \vee (q \wedge r)$ is true.
If $p$ is true then both $p \vee q$ and $p \vee r$ are true, so their conjunction is true.
If $q \wedge r$ is true then $q$ is true and $r$ is true, so again both $p \vee q$ and $p \vee r$ are true, and their conjunction is true.
Therefore $p \vee (q \wedge r) \implies (p \vee q) \wedge (p \vee r)$.
4. Conclusion: Since each formula implies the other we have the biconditional $ (p \vee q) \wedge (p \vee r) \iff p \vee (q \wedge r) $.
This means the equivalence is a logical truth (the biconditional is true for every assignment of truth values to $p,q,r$).
5. Relation to the truth table: The rows of the provided truth table assign every combination of truth values to $p,q,r$ and compute both expressions.
For each row the truth values of $ (p \vee q) \wedge (p \vee r) $ and $ p \vee (q \wedge r) $ coincide, which confirms the equivalence by exhaustive checking.
Final answer: $ (p \vee q) \wedge (p \vee r) $ is logically equivalent to $ p \vee (q \wedge r) $.