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Philosophy of Logic - counterexamples

Discussion in 'The Coffee House' started by Abacus21, Apr 20, 2009.

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  1. Abacus21

    Abacus21 Staff Alumni

    OK, so this is partially to help me with my revision, and also just because I think it's a small amount of fun..
    I usually like doing these, but now I am totally stuck on them for some reason today...

    Format goes like this:

    * = They have to be true in a sense, as long as they fall into what people perceive to be true, then all's well. For example, one could have "All Unicorns are magical horses."

    The best I've got so far:

    All dogs are animals
    Some animals are cats
    Therefore, some cats are animals.

    You get the idea...

    Can anyone think of any?
  2. black orchid

    black orchid Well-Known Member

    errrrr...i think this is right....

    all trees are plants,
    some plants are daisies
    therefore some daisies are trees

    all goths are people
    some people are chavs
    therefore some goths are chavs :eek:hmy:

    all chocolates are foods
    some foods are vegetables
    therefore some vegetables are chocolates

  3. Abacus21

    Abacus21 Staff Alumni

    Yup, spot on :)

    Another (somewhat tenuous!) one I came up with earlier:

    All human blood is red
    Some red things are also roses
    Therefore, some roses are human blood.
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