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Spivak has a pretty decent calculus textbook that you might find interesting. I used a different textbook, but I believe that Spivak is more popular.

• jacobolus 7y ago
  The point of Spivak’s book is to be rigorous and offer hard problems, not teach the basics of how calculus is used. Doing epsilon–delta proofs can be fun, but it’s mostly useful for aspiring pure mathematicians, and not really relevant per se for the grandparent poster.
  • vostok 7y ago
    I took this to mean that they're interested in a more rigorous treatment. > [I] am now in a graduate CS program, I feel like I’m missing the deeper understanding of many of the formulas that are presented > My plan is to get through it to get some background on the main ideas of calculus
    • jacobolus 7y ago
      If someone has never taken a calculus course, and many formulas are presented in other types of technical books which were developed using calculus, then those formulas will seem somewhat mysterious/foreign. Doing delta–epsilon proofs isn’t necessary to clear that up though. Just a regular introductory calculus curriculum is likely sufficient.