When I was about 15, I found this one, “Granville,” in a Brooklyn used bookstore: http://djm.cc/library/Elements_Differential_Integral_Calculus_Granville_edited

When I was about 15, I found this one, “Granville,” in a Brooklyn used bookstore: http://djm.cc/library/Elements_Differential_Integral_Calculus_Granville_edited_2.pdf http://djm.cc/library/Elements_Differential_Integral_Calculu... It was terrific, I learned to differentiate well. Now Feynman, at that age, was more advanced. This was HIS book, “Woods”: https://drive.google.com/file/d/1G1zLVgEmKsK5QGoyMixJXV9DlzRRInJP/view?usp=drivesdk https://drive.google.com/file/d/1G1zLVgEmKsK5QGoyMixJXV9DlzR...