Remembering mathematics

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My own experience learning math is that I often forget a lot of what I learn even if I read everything and do plenty of exercises. It's quite discouraging to forget so much, and one thing I want to understand better is how much is "normal" to forget, how to forget less, etc.

From Tao's Analysis I:

The subject matter [real analysis] is too vast to force the students to memorize the definitions and theorems, so I would not recommend a closed-book examination, or an examination based on regurgitating extracts from the book. (Indeed, in my own examinations I gave a supplemental sheet listing the key definitions and theorems which were relevant to the examination problems.)

Vladimir Nesov:

When I first worked through this book, it didn’t result in long-term retention of the material (I’m sure some people will be able to manage, just not me, not without meditating on it much longer than it takes to work through or setting up a spaced repetition system).

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