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Show that (๐‘ โ†’ ๐‘ž) โˆจ (๐‘ โ†’ ๐‘Ÿ) and ๐‘ โ†’ (๐‘ž โˆจ ๐‘Ÿ) are logically equivalent

Question

Show that (๐‘ โ†’ ๐‘ž) โˆจ (๐‘ โ†’ ๐‘Ÿ) and ๐‘ โ†’ (๐‘ž โˆจ ๐‘Ÿ) are logically equivalent

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Solution 1

To show that (๐‘ โ†’ ๐‘ž) โˆจ (๐‘ โ†’ ๐‘Ÿ) and ๐‘ โ†’ (๐‘ž โˆจ ๐‘Ÿ) are logically equivalent, we can use truth tables.

Step 1: Define the truth values for p, q, and r.

p q r
T T T
T T F
T F T
T F F
F T T
F T F
F F T
F F F

Step 2: Calculate the truth values for (๐‘ โ†’ ๐‘ž), (๐‘ โ†’ ๐‘Ÿ), and (๐‘ž โˆจ ๐‘Ÿ).

p q r (๐‘ โ†’ ๐‘ž) (๐‘ โ†’ ๐‘Ÿ) (๐‘ž โˆจ ๐‘Ÿ)
T T T T T T
T T F T F T
T F T F T T
T F F F F F
F T T T T T
F T F T T T
F F T T T T
F F F T T F

Step 3: Calculate the truth values for (๐‘ โ†’ ๐‘ž) โˆจ (๐‘ โ†’ ๐‘Ÿ) and ๐‘ โ†’ (๐‘ž โˆจ ๐‘Ÿ).

p q r (๐‘ โ†’ ๐‘ž) (๐‘ โ†’ ๐‘Ÿ) (๐‘ž โˆจ ๐‘Ÿ) (๐‘ โ†’ ๐‘ž) โˆจ (๐‘ โ†’ ๐‘Ÿ) ๐‘ โ†’ (๐‘ž โˆจ ๐‘Ÿ)
T T T T T T T T
T T F T F T T T
T F T F T T T T
T F F F F F F F
F T T T T T T T
F T F T T T T T
F F T T T T T T
F F F T T F T T

As you can see, the truth values for (๐‘ โ†’ ๐‘ž) โˆจ (๐‘ โ†’ ๐‘Ÿ) and ๐‘ โ†’ (๐‘ž โˆจ ๐‘Ÿ) are the same for all possible values of p, q, and r. Therefore, (๐‘ โ†’ ๐‘ž) โˆจ (๐‘ โ†’ ๐‘Ÿ) and ๐‘ โ†’ (๐‘ž โˆจ ๐‘Ÿ) are logically equivalent.

This problem has been solved

Solution 2

To show that (๐‘ โ†’ ๐‘ž) โˆจ (๐‘ โ†’ ๐‘Ÿ) and ๐‘ โ†’ (๐‘ž โˆจ ๐‘Ÿ) are logically equivalent, we can use truth tables.

Step 1: Define the truth values for p, q, and r.

p q r
T T T
T T F
T F T
T F F
F T T
F T F
F F T
F F F

Step 2: Calculate the truth values for (๐‘ โ†’ ๐‘ž) โˆจ (๐‘ โ†’ ๐‘Ÿ) and ๐‘ โ†’ (๐‘ž โˆจ ๐‘Ÿ).

Remember that the implication p โ†’ q is false only when p is true and q is false, otherwise it's true. The disjunction p โˆจ q is true if either p or q is true.

p q r (๐‘ โ†’ ๐‘ž) (๐‘ โ†’ ๐‘Ÿ) (๐‘ โ†’ ๐‘ž) โˆจ (๐‘ โ†’ ๐‘Ÿ) ๐‘ž โˆจ ๐‘Ÿ ๐‘ โ†’ (๐‘ž โˆจ ๐‘Ÿ)
T T T T T T T T
T T F T F T T T
T F T F T T T T
T F F F F F F F
F T T T T T T T
F T F T T T T T
F F T T T T T T
F F F T T T F T

Step 3: Compare the columns for (๐‘ โ†’ ๐‘ž) โˆจ (๐‘ โ†’ ๐‘Ÿ) and ๐‘ โ†’ (๐‘ž โˆจ ๐‘Ÿ).

As you can see, the truth values in these columns are the same for all possible values of p, q, and r. Therefore, (๐‘ โ†’ ๐‘ž) โˆจ (๐‘ โ†’ ๐‘Ÿ) and ๐‘ โ†’ (๐‘ž โˆจ ๐‘Ÿ) are logically equivalent.

This problem has been solved

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