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Critical Thinking

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All flies are winged creatures.
All butterflies are winged creatures
Therefore, all butterflies are flies

I believe this is an invalid syllogism, not 100% sure. Can you explain why it would be valid or invalid please

  • Critical Thinking -

    A valid syllogism is:

    All A are B
    C is A
    (since C is A and all A are B)
    C is B

    The non-syllogism above is:

    All A are B
    All C are B
    Therefore all A are B.

    Erm, no.

    Spot the difference. Here's one of the same form:

    All fish are animals
    All birds are animals
    Therefore all fish are birds.

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