@grogror The best stab at presenting this level in a comprehensible way is http://www.amazon.com/Calculus-Made-Easy-Silvanus-Thompson/dp/0312185480/ … (old free version http://www.djm.cc/library/Calculus_Made_Easy_Thompson.pdf …)
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. Banned in Sweden. SubGenius, Zhuangist, white-hat troll. Defrocked mathematician. Brain problems.