Determine whether the following symbolized arguments are valid or invalid byconstructing a truth table for each:1. K ⊃ ~K ./ ~K2. R⊃ R ./ R
Question
Determine whether the following symbolized arguments are valid or invalid byconstructing a truth table for each:1. K ⊃ ~K ./ ~K2. R⊃ R ./ R
Solution
To determine the validity of the symbolized arguments, we need to construct truth tables for each argument.
- K ⊃ ~K ./ ~K
To construct the truth table for this argument, we need to consider all possible truth values for the proposition K and its negation ~K.
| K | ~K | K ⊃ ~K | ~K |
|---|---|---|---|
| T | F | F | F |
| F | T | T | T |
In the truth table, we can see that when K is true, ~K is false, and the implication K ⊃ ~K is false. Similarly, when K is false, ~K is true, and the implication K ⊃ ~K is true. Therefore, the argument is invalid because there is at least one row in the truth table where the premise (K ⊃ ~K) is true and the conclusion (~K) is false.
- R ⊃ R ./ R
To construct the truth table for this argument, we need to consider all possible truth values for the proposition R.
| R | R ⊃ R | R |
|---|---|---|
| T | T | T |
| F | T | F |
In the truth table, we can see that regardless of the truth value of R, the implication R ⊃ R is always true. Therefore, the argument is valid because in every row of the truth table where the premise (R ⊃ R) is true, the conclusion (R) is also true.
In summary:
- The argument "K ⊃ ~K ./ ~K" is invalid.
- The argument "R ⊃ R ./ R" is valid.
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