I wonder whether can we make an inference of A←s→C from A‑m→B‑m→C? (reference: PT62 section 2 Q19)

For sure, it would be an invalid argument if an inference of A‑m→C is made.

Neither the lessons from The Valid Argument Forms nor the from The Invalid Argument Forms include this inference.

Seems ok to me.

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3 comments

  • Thursday, Oct 24 2019

    Unless you know the relative sizes of A B and C that is not something you can infer

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  • Thursday, Oct 24 2019

    A

    A

    AB

    AB

    AB

    AB

    BC

    BC

    BC

    BC

    BC

    No, you can't. I drew it out for you

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  • Thursday, Oct 24 2019

    I think only your first relationship can be a partial relationship

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