I think I reasoned my way though this as I wrote it out. Figured I’d post it in case anyone might be helped by it. Please point out any issues.
I get that every NA is an assumption the argument actually makes. Why? bc for an argument to work, the NA must be true which entails that if the argument has a NA, the argument is obviously making that assumption. But is the inverse also true? Is every assumption the argument actually makes a NA?
My understanding is that most SAs are assumptions we impose on the argument, not ones that the argument actually makes. Sometimes the assumption the argument makes happens to also be a SA. Eg
P: A
C:B
A->B is the NA as well as SA. This seems to affirm every assumption argument actually makes is a NA.
Is it wrong to think of SAs as assumptions we impose on the argument?
Are there times an argument actually makes an assumption that isn’t necessary? I guess technically there could be an assumption within a stimulus or argument that’s unrelated or irrelevant to the conclusion’s reasoning and therefore it being false wouldn’t wreck the conclusion and isn’t needed. LSAT typically doesn’t do this though.
Okay I think I figured this out. Just bc the argument assumes something doesn’t make it a NA but every NA is something the argument assumes. So to check whether a NA Q ac is wrong, ask if the arg assumes that AC. If it doesn’t then eliminate. 8/10 times if argument does assume AC, it’s the correct ac. That’s typically what I do when I’m a bit unsure on NA Qs instead of negation test. More intuitive for me.