Valid or Invalid? Test your ability to spot whether a syllogism is valid or invalid. New experiment (still in beta). http://bit.ly/1sSGoyV
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@PhilosophyExp Shouldn't S2 (some photographs are not cartoons) be valid? Or am I missing something?
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@PhilosophyExp I see, so the problem is that we can't presume the existence of any photographs and so we can't say 'some', correct? -
.@trilibrylnu Yes. "All dragons breathe fire" - doesn't mean "Some (1 or more) dragons breathe fire", because the class "dragons" is empty.
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@PhilosophyExp Ok, I considered 'some X are not Y' to be a weaker version of 'no X are Y' without realizing it implies existence. Thanks!
End of conversation
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