syllogism, truth-functional, or neither?


  1. I dreamed that John F. Kennedy was born in 1917, and everything I dream is true. Therefore, Kennedy was born in 1917.
  2. All horses are animals. Therefore, all heads of horses are heads of animals.
  3. If 'There is no truth' is true, it is false. Thus, it is false.


Posted 2018-08-29T04:21:03.573

Reputation: 11

First off welcome to philosophy.SE. For questions, you should limit yourself to one-question per question. "syllogism" is a word that has more than one functional meaning. Can you clarify the definition you were taught to use? – virmaior – 2018-08-29T04:24:13.287

well to clarify, the question said "syllogistic," and for the definition, we simply learned that we can derive a conclusion from propositions and can appraise validity through venn diagrams. – Monica – 2018-08-29T04:34:24.160

What is your def of Syllogism ? It seems to me that you are using it as synonym of valid argument.

– Mauro ALLEGRANZA – 2018-08-29T06:39:31.723

The course does not specify its definition of syllogistic sentence. I am supposing it wants me to use a general definition. – Monica – 2018-08-29T06:53:37.860

Truth functional may mean : symbolized with classical propositional logic. If so, both 1 and 2 are not truth-fucntional (they need quantifiers). – Mauro ALLEGRANZA – 2018-08-29T07:30:49.987

So I guessed that 1 would be syllogistic, 2 being neither, and 3 being truth functional. would that be correct? – Monica – 2018-08-29T10:18:41.827

No answers