Is it obvious that a network of neurons can explain how we see? There is an apocryphal story about the mathematician Hardy, who wrote an equation on the blackboard and said "The proof of this is obvious". After a little while he murmured "At least I think it is", and left to check the proof in the library, only returning just before the end of the lecture to announce "Yes, it is obvious". Sometimes, mathematical techniques are necessary to be sure...
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