Question
Apply quantification rules to prove the validity/invalidity of the following syllogistic arguments.
i) All dogs are animal. All animal are living being. Therefore, No dogs are living being.
ii) Some philosophers are Women. All philosophers are studious persons. Therefore some studious persons are women.
iii) No men are mortal. Ram is a man. Therefore, Ram is not mortal.
iv) Some musicians are singer. Some cricketers are singer. Therefore some musicians are cricketers.
Answer :
Word Count : 446
i) Argument: All dogs are animal. All animals are living beings. Therefore, no dogs are living beings.
- Quantification Rules:
- "All dogs are animals" can be written as: ∀x (Dog(x) → Animal(x)).
- "All animals are living beings" can be written as: ∀x (Animal(x) → LivingBeing(x)).
- The conclusion, "No dogs are living beings," can be written as: ∀x (Dog(x) → ¬LivingBeing(x)).
- Analysis:
- From the first premise, ∀x (Dog(x) → Animal(x)), and the second premise, ∀x (Animal(x) → LivingBeing(x)), we can combine them via hypothetical syllogism: ∀x (Dog(x) → LivingBeing(x)).
- However, the conclusion contradicts this, as it states that all dogs are not living beings.
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