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Other Khan Academy or Textbook?

  1. Jun 29, 2015 #1
    Should I use khan academy or just by a text book to learn and review some pre-uni & 1st year undergrad level mathematics for a physics degree? Which would be more fluid and clearer? Is there questions for khan academy? Is a maths books on mechanics relevant, or will any good physics book teach me all the mechanics I need?

    Background: I've been out of maths for a year but I'm going uni to study physics in a few months, so I want to brush up on my maths skills during that time. Some topics I covered at school were complex numbers, polar coordinates, calculus(taylor&maclaurin, 1st&2nd order diff, integrals), introductory vector algebra.

    I was thinking about getting Mathematical Methods in The Physical Sciences by Mary L. Boas.
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  3. Jun 29, 2015 #2
    Textbook, without a doubt. Khan Academy is pretty nice, but you can't rely only on that alone. You need to get a textbook and work through the problems.

    Boas is a very nice book if you're comfortable with calculus. Definitely recommended!
  4. Jun 29, 2015 #3


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    Out of curiosity, are you saying this as a mathematician ? What do mathematicians think of this book ?
  5. Jun 29, 2015 #4
    If your goal is to learn mathematics for physics, then Boas is a good choice. If your goal is to learn mathematics for mathematics, then it's not a good choice.
  6. Jun 29, 2015 #5


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    That is definitely the case. What I meant was more like, do you have to unlearn things from this book if you want to do mathematics for mathematics later ? Is this book better than other methods books in that aspect ?
  7. Jun 29, 2015 #6


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    Based on what you want to brush up on I would also agree that a textbook is a great idea.

    Khan Academy would be idea if you need help with anything elementary, basic algebra, some trig, geometry, and calculus, but beyond those subjects there isn't too much help there.

    I would suggest looking at a local library for some good text books or finding some free ones online. And then using Khan Academy's calculus sections to work on Calc 1 and Calc II material. If you go to Khan Academy and check the subjects --> Calc I or Calc II you can shift through the available questionaire's and videos and work on some problems.
    Unfortunately, they don't have any problems for Calc III material.
  8. Jun 29, 2015 #7


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  9. Jun 30, 2015 #8


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    I would suggest something else.

    Paul Online notes are awesome : http://tutorial.math.lamar.edu/ You can find Algebra, Calculus I, II, III and differential equations. For the trigonometry, Paul Dawkins doesn't have great ressource on this topic, there is just a small chapter but that's not engouh in my opinion so I would subject a textbook or KA.

    I mastered all the master challenge on Khan Academy and thought I knew those subjects. It turned out that I had a good grasp of things but it was not perfect. I started using Paul Online Notes and A first course in Calculus by Serge Lang and I can say that Khan Academy is great but not enough. KA gives you a false feeling of knowledge. At least, that was the case for me. I agree with micromass that KA is really great but only if it is coupled with a textbook.

    Good luck.
  10. Jun 30, 2015 #9
    Cosign. KA is not enough tbh.
  11. Jun 30, 2015 #10
    No, you don't have to unlearn anything. Boas offers great intuition and applications. It's just not rigorous (which is obvious immediately), and offers not really many proofs. It's not like a math book where everything is proven and stated rigorously.
  12. Jun 30, 2015 #11
    I think I'm gonna go for Engineering Mathematics by Stroud; Boas seems to expect a level of calculus which I'd say is too high for where I'm at right now.
  13. Jun 30, 2015 #12
    Why not just do a good calculus book?
  14. Jun 30, 2015 #13
    Is a calculus book not too narrow, or does it go in depth with other topics?
  15. Jun 30, 2015 #14
    Too narrow for what? You need to know calculus anyway. What is your goal at this point?
  16. Jun 30, 2015 #15
    What I mean't was, since a calculus is an actual branch of maths will it not be specialised on that topic leaving other topics uncovered?
  17. Jun 30, 2015 #16
    But what other topics? I'm not sure I know what you're trying to do. You can learn other topics after you've done calculus.
  18. Jun 30, 2015 #17
    Well when I did maths, I remember not just covering diff & int but also topics such as vectors, complex numbers, vectors, series, matrics, polar coordinates etc, not just calculus on its own.
  19. Jun 30, 2015 #18
    In high school, that is true. But if you go to university, you will meet far less courses that cover many general topics like his. They are split up in several courses. Calculus, for example, will cover differentials, integrals, vectors (in multivariable calculus), series, matrices (in multivariable calculus) and polar coordinates. Another useful course is linear algebra which covers complex numbers, vectors and matrices. Those are two important courses. If you're interested in physics, then you can complete your math knowledge with a methods course which uses Boas.
  20. Jun 30, 2015 #19
    Sometimes I go for to khan academy just for refreshing purposes, but to solidify my skills I prefer a textbook. A good calculus mathematics textbook that I can recommend to you is Calculus: Early Transcendentals by James Stewart. This book is good on applications of engineering and other sciences, I don't remind if this book has some physics exercises. Also this book covers various topics of calculus like multivariable calculus and series, etc.
  21. Jun 30, 2015 #20


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