Hardest field of mathematics?

[df s]

What do the MIT Math Ph.Ds usually specialize in? Number theory or something? I've always thought the calculus is as hard as math will ever get, but I was wrong, wasn't I? Do math graduate students even study calculus?

[Scranderberry]

At undergraduate university level it doesn't really get any harder, just a lot more of the same difficulty - well thats how I found it anyway. And lots of it. You can choose any area to specialise in and it depends if you do Pure maths, applied maths, statistics, etc...
In fact i think 1st year was the hardest, 2nd and third year weren't really all that hard and most of 1st year is the same stuff i did at high school, just more refined.
I think proofs were hardest

When you say "Calculus", thats really quite broad, but i dont think it gets much harder than the hardest stuff I did in high school
The thing is, the more maths you learn, the more your mind gets used to thinking that way, so its easier to understand the harder concepts.

[phoenixstarshine]

I hate to say this, but calculus today is a high school junior course.