Example #3

Logic Chapter Four

If the above two statements are true, we get: c. Without nuclear weapons, the world is likely to be destroyed by man-made disasters.

So is c correct? If there is a mistake, where is it?

Answer:

b. Assuming that the leaders of various countries are not worried about nuclear war, the world is likely to be destroyed by manmade factors. When we look at this sentence alone, if we ignore the semantics and other external interpretations and make it true, Then according to deductive reasoning, the statement of C is indeed true.

related, so the inference of c is not correct.

The "if world leaders would not be afraid of war with nuclear weapons" interpretation of a.b is actually different: a: Since it won't happen, there's nothing to worry about. b: Even if it happens, don't worry about it.

Therefore, in the case of semantics (including the contextual connection of the two sentences), the two sentences are not

Thinking about it in another way, argument b is true under common sense and actually has the premise of "even if there are nuclear weapons", and the reason why c is wrong is that this premise contradicts with's "if there are no nuclear weapons".

That is to say, the statement b is not true under the unspecified conditions, so it cannot be inferred in this way.