Determine whether the following argument is valid. Justify your answer by first translating each statement into propositional logic to obtain the form of the argument. Then prove that the form is valid or invalid. If it is not cloudy or not windy, then we will visit the nearby town and do shopping. If we visit the nearby town, then we will dine at a restaurant. We did not dine at restaurant. .. It was cloudy.

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### Argument Validity Exercise

**Determine whether the following argument is valid. Justify your answer by first translating each statement into propositional logic to obtain the form of the argument. Then prove that the form is valid or invalid.**

#### Argument Description:
```
If it is not cloudy or not windy, then we will visit the nearby town and do shopping.
If we visit the nearby town, then we will dine at a restaurant.
We did not dine at a restaurant.
∴ It was cloudy.
```

### Steps to Approach:
1. **Translate the statements into propositional logic.**
2. **Evaluate the logical form and determine its validity.**

### Propositional Logic Translation:
1. Let **C** represent "It is cloudy."
2. Let **W** represent "It is windy."
3. Let **T** represent "We will visit the nearby town."
4. Let **D** represent "We will dine at a restaurant."

Using these representations, translate each statement:

- **Statement 1**: "If it is not cloudy or not windy, then we will visit the nearby town and do shopping."
  - Logical Form: \( (\neg C \lor \neg W) \rightarrow T \)

- **Statement 2**: "If we visit the nearby town, then we will dine at a restaurant."
  - Logical Form: \( T \rightarrow D \)

- **Statement 3**: "We did not dine at a restaurant."
  - Logical Form: \( \neg D \)

- **Conclusion**: "It was cloudy."
  - Logical Form: \( C \)

### Logical Structure:
Combining the statements, the argument's structure is:
1. \( (\neg C \lor \neg W) \rightarrow T \)
2. \( T \rightarrow D \)
3. \( \neg D \)
4. ∴ \( C \)

### Evaluation:
- From statement 3 (\( \neg D \)), and statement 2 (\( T \rightarrow D \)), we can deduce \( \neg T \) (by Modus Tollens).
- From \( \neg T \) and statement 1 (\( (\neg C \lor \neg W) \rightarrow T \)), we know that for \( T \) to be false, \( \neg C \lor \neg W \) must be false.
- The expression \( \neg C \lor \neg W
Transcribed Image Text:### Argument Validity Exercise **Determine whether the following argument is valid. Justify your answer by first translating each statement into propositional logic to obtain the form of the argument. Then prove that the form is valid or invalid.** #### Argument Description: ``` If it is not cloudy or not windy, then we will visit the nearby town and do shopping. If we visit the nearby town, then we will dine at a restaurant. We did not dine at a restaurant. ∴ It was cloudy. ``` ### Steps to Approach: 1. **Translate the statements into propositional logic.** 2. **Evaluate the logical form and determine its validity.** ### Propositional Logic Translation: 1. Let **C** represent "It is cloudy." 2. Let **W** represent "It is windy." 3. Let **T** represent "We will visit the nearby town." 4. Let **D** represent "We will dine at a restaurant." Using these representations, translate each statement: - **Statement 1**: "If it is not cloudy or not windy, then we will visit the nearby town and do shopping." - Logical Form: \( (\neg C \lor \neg W) \rightarrow T \) - **Statement 2**: "If we visit the nearby town, then we will dine at a restaurant." - Logical Form: \( T \rightarrow D \) - **Statement 3**: "We did not dine at a restaurant." - Logical Form: \( \neg D \) - **Conclusion**: "It was cloudy." - Logical Form: \( C \) ### Logical Structure: Combining the statements, the argument's structure is: 1. \( (\neg C \lor \neg W) \rightarrow T \) 2. \( T \rightarrow D \) 3. \( \neg D \) 4. ∴ \( C \) ### Evaluation: - From statement 3 (\( \neg D \)), and statement 2 (\( T \rightarrow D \)), we can deduce \( \neg T \) (by Modus Tollens). - From \( \neg T \) and statement 1 (\( (\neg C \lor \neg W) \rightarrow T \)), we know that for \( T \) to be false, \( \neg C \lor \neg W \) must be false. - The expression \( \neg C \lor \neg W
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