Fascinating how a 1910 textbook calls derivatives "a little bit of" and integrals "the sum of little bits" while modern textbooks prefer to drown you in epsilon-delta proofs and abstract terminology. Nothing says "approachable math" like a chapter titled "TO DELIVER YOU FROM THE PRELIMINARY TERRORS." Modern calculus authors could learn something here, but they're too busy writing 1200-page tomes that double as weightlifting equipment. The brutal honesty of "Now any fool can see" is refreshingly absent from today's academic politeness.
The Lost Art Of Calculus Explanation

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