Difficult: The proofs of theorems 7.8 and 7.9 are a bit tricky. Also, the theorems themselves make perfect sense now, but I can them getting tricky if they are generalized in future sections.
Reflective: (ab) = b-1a-1 reminds me of something I think from linear algebra, but I can't seem to remember what.
Thursday, March 5, 2009
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