Does it really matter which calculus is taught first? A book I had that I've recently returned to the library was written by a mathematician who said that neither of the subjects are harder but integral is usually taught after differential. He also said that sometimes people are taught integral before differential. My current teacher (not exactly a teacher more like a person who assists me when I have trouble, since technically Im not in school) told me he was taught differential first and then integral. So it seems that integral would be a bit more difficult or perhaps complex than differential calculus? The only reason I could find for teaching/learning differential before integral is that when I was looking in my calculus book the other day I skipped a lot of chapters and went to the integral part. My book says its basically backwards differentiating, and it uses some laws that I learned when I started on differential calculus like the power rule etc. So would it really affect you significantly if you learn integral before differential or vice versa? Because if integrating is backwards differentiating, then differentiating is backwards integrating, seems to me like it wouldnt really matter that much.