Hello, all:
Just so you don't have to bring up the curriculum or your notes, argument form six is as follows:
A → B
A → C
B ←s→ C
I don't have a question about why we may infer "B ←s→ C" from the premises above, but rather, I have a question about the inferences we can make from the individual premises themselves, inherently.
From what I understand, without a background in formal logic (or informal logic, for that matter), it seems we assume that universally quantified statements imply the existence of their subjects on the LSAT. This is what allows us to infer "most" and "some" from "all" on the LSAT - correct? If this is the case, then can't we infer "/B -m→ /A" and "/B ←s→ /A" from "A → B" (or /B → /A) and "/C -m→ /A" and "/C ←s→ /A" from "A → C" (or /C → /A)?
I'm not sure whether we'd be tested on these inferences if we're indeed able to infer them, or if past LSATs have tested them at some point, but I thought I'd ask. Presumably, LSAC is testing our ability to see that the premises above, "A → B" and "A → C," allow us to infer "B ←s→ C."
Thank you all for your time! Best wishes to you all in your studies!
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