Invalid Argument Forms: "consecutive mosts"

Adam Z. Xie

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.

jinnie871

I think only your first relationship can be a partial relationship

noonawoon

A
A
AB
AB
AB
AB
BC
BC
BC
BC
BC

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

Michael.Cinco

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