Today I was tired. During my study time, I read through the review exercises for the textbook chapter I am wrapping up; I chose which ones I will do, but did not start work on them. I also read more of Infinite Powers, in which Strogatz has begun to discuss calculus in its modern form. In the section I read today, he explained how the discovery of the Fundamental Theorem of Calculus, which links derivatives and integrals, made it possible to calculate many integrals which had previously been beyond reach.
I apologize for not replying to comments for the past month or so. Things have been thingish, as readers of this blog will know. I think I’ve now answered everything.