Difference between Calculus 4th edition and Calculus 3rd edition by Michael Spivak? I currently possess Calculus 3rd edition by Michael Spivak in it's electronic form. However, I am considering buying a hard copy and have the option of buying either a used 3rd edition or a new 4th edition. Since, the 4th edition is quite costly for me, I want to be absolutely sure before buying. I haven't been able to locate an electronic copy of the 4th edition anywhere. So, would someone be kind enough to tell me precisely the differences between the two books. I expect to solve a good amount of hard calculus problems so I would choose whichever has more problems. Thank you for your help.