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>you must have memorized derivation steps //

Certainly later on, like with QFT, I was left to grope in the dark recesses of memory for the next step in a proof of some corollary or other but I found that understanding how a proof works means that the steps make sense in the same way as having to pull down your trousers before pulling down your underwear. Yes there is memorisation involved but nothing like that required to establish who was the King of France in 1492.

I did say "practically", perhaps "comparatively" would have been more to the point.



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