Most Difficult Undergraduate Math Courses

The Top Ten
1 Differential Equations
2 Real Analysis

I meant lower division (not undergraduate) when I created this list, but oh well. Analysis is rather annoying at times.

3 Multivariable Calculus
4 Partial Differential Equations
5 Differential Geometry
6 Single Variable Calculus
7 Abstract Algebra
8 Linear Algebra
9 Probability Theory
10 Precalculus
The Contenders
11 Geometry
12 Algebra
13 Statistics
14 Trigonometry
15 Prealgebra
16 Complex Analysis
17 Number Theory
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