Of course, mathematical card tricks are card magic. The key is to make sure they look like magic, more that math. Perci Diaconis has a great book call Magical Mathematics. The effects are great, the math is beyond my understanding. Perci actually dropped out of high school at age 14 to travel around the country with Dai Vernon. He eventually went back to school, earned a PhD from Havard and is a professor of Statistics and Mathematics at Stanford.
There is some great mathematical principles out there in Stewart James' Miraskill or in the Jonah Principle (great 10 card poker deal effect in Woody Aragon's A Book in English).
That said, don't limit yourself to just mathematical principles. There are a lot of effects that don't require any sleight of hand. Some great books include Scarne on Card Tricks, Encyclopedia of Card Tricks, Fulves Self Working Card Tricks / More Self Working Card Tricks and Steinmeyer's Impuzzabilities series. Also, the use of gimmicks, such as double backed cards, easily accomplishes things that sleight of hand cannot.