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[https://www.quora.com/Was-there-a-certain-age-when-abstract-physics-or-math-concepts-clicked-and-suddenly-made-sense-or-has-it-always-come-naturally-to-you/answer/Brian-Bi Brian Bi]: "Easy stuff (basic algebra, trig, differential and integral calculus) clicked instantly. Slightly harder stuff like multivariate calculus and linear algebra didn't click right away---I had to go through them a few times. And more advanced topics like group theory haven't clicked yet, but I'm confident they will eventually."

[http://colah.github.io/posts/2015-08-Backprop/ Christopher Olah]: "Derivatives are cheaper than you think. That’s the main lesson to take away from this post. In fact, they’re unintuitively cheap, and us silly humans have had to repeatedly rediscover this fact. That’s an important thing to understand in deep learning. It’s also a really useful thing to know in other fields, and only more so if it isn’t common knowledge."

==See also==

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