I always considered my first real math course to be Calc I or Calc II simply because it is the first time you deal with infinity.  Limits, etc.  Everything before that I don't really consider math.  When speaking with a professor recently, however, he mentioned that he thought the first real math course people had in life was matrix theory.  I can see why he said this as it does start to deal with theory and abstract concepts way more, but I don't know if I agree with that...


What are your thoughts?  What do you consider the first real math course?