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The $\leq$ direction is clear to me, but I do not know how the other direction works: I understand all the steps but I do not understand how this proofs anything in terms of dim R.
Image may be NSFW.
Clik here to view.
The $\leq$ direction is clear to me, but I do not know how the other direction works: I understand all the steps but I do not understand how this proofs anything in terms of dim R.