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Full Idea
I deny that when p grounds q, q thereby reduces to p, and I deny that if q reduces to p, then p grounds q. ...On my view, reduction is nothing other than identity, so p is the same fact as q.
Gist of Idea
Reduction is just identity, so the two things are the same fact, so reduction isn't grounding
Source
Paul Audi (Clarification and Defense of Grounding [2012], 3.5)
Book Ref
'Metaphysical Grounding', ed/tr. Correia,F/Schnieder,B [CUP 2012], p.110
A Reaction
Very good. I can't disagree with any of it, and it is crystal clear. Philosophical heaven.