For people interested in calculus, there is always a ton of new youtube videos, of varying quality and fun-to-solemnity ratio. Again I mostly like the geometrical presentations.

Currently reading a historic (famous and celebrated) book on calculus, by Gardner. But although the first chapters were indeed a different approach (from first principles etc), now, 1/5 in the book, I was a bit surprised that Gardner considered it non-incogruous with his own stated approach to spend so many pages on presenting how to differentiate when you have multiplied or divided functions (who wants to read about division of polynomials here ), when he hasn't even shown to the reader why differentiation actually matters.

Then again the book has a co-author, so maybe those parts were written by the latter and the order was a compromise. Style is a bit inconsistent I am obviously waiting for the part about the anti-derivative.

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