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When I was reading Mathematics for University honours, I would sometimes, after working a week or two at some new book, and mastering ten or twenty pages, get into a hopeless mudcUe, and find it just as bad the next morning. My rule was to begin the book again. And perhaps in another fortnight I had come to the old difficulty with imperus enough to get over it. Or perhaps not. I have several books that I have begun over and over again.
My second hint shall be – Never leave an unsolved difficult behind. I mean, don’t go any further in that book till the difficulty is conquered. In this point, Mathematics differs entirely from most other subjects. Suppose you are reading an Italian book, and come to a hopelessly obscure sentence – don’t waste too much time on it, skip it, and go OR; you will do very well witbout it. But if you skip a trUJthema’iieaJ difficulty, it is sure to crop up again: you will find some other proof depending on it. and you will only get deeper and deeper into the mud.
My third hint is. only go on working so long as the brain is quite clea£ The moment you feel the ideas getting confused leave off and rest, or your penalty will be that you will never learn Mathematics (Lewis Carrol)

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