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parineumlast Friday at 2:37 PM2 repliesview on HN

Not really.

> All cats are white.

> All the cats I see are black.

The second statement doesn't actually imply that all cats are black but it does refute that all cats are white. It doesn't make it's own claim about all cats, it just adds an anecdote that doesn't conform to the first statement.


Replies

bulbarlast Friday at 6:19 PM

The second statement implies the negation of the first though. So OP is correct assuming the term "claim" includes "implies".

However, the original argument regarding smoking bias is correct of course.

wolvesechoesyesterday at 11:55 AM

It negates original assertion. There is no difference between assertion and negation in logic.