Aschenbrenner was pretty awful. He was unclear, often got his own examples wrong, and could not answer questions. He would hold classes in past the ending time and get angry when people would leave. The class averages on the two midterms were a 42 and a 66 and I forget the final average, but it was around a 50-55. The curve ends up helping a lot (I had a Fail that curved to a B-) but people who have taken calculus before have an unfair advantage and skew the curve too. The homework and class quizzes are super easy but the midterms and final were insanely hard. He gives out the answer keys right after the tests, so you know what you got right away if you calculate it.

He's a great professor a lot of people only say he sucks because his midterms and final are challenging but not impossible. There is a curve at the end of the class that does come in handy in helping your grade. Practice a lot of examples from the books and practice midterms and you'll do fine. He's a really great professor people only complain because they didn't get the grade they wanted in the class.

Matthias is a very clear lecturer, and effectively builds up the course material from the ground up, which is the purpose of this class: proving the material of single variable calculus from first principles. He gave easy tests, with medians of 79%, 68%, and 81% (Midterms 1 & 2, then the Final). I got 98%, 93% and 96% by just ensuring that I knew and understood the import definitions/theorems from the class. The homework problems can be challenging, but extra credit problems on them should keep your HW grade close to 100%. He does grade on the absolute scale. Very chill guy, would take a class with him again!

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Aschenbrenner is an awesome professor. Not only is he a clear lecturer but also an understanding and great person. He effectively taught this class virtually and ensured we understood the material (even asynchronously) by being available on email. 131A is definitely not an easy class but I think I was able to take the most out it because of him. Would definitely recommend him for any class.

Note: he did tweak the syllabus and decided not to teach limsup and liminf, which I think is important for any Analysis class.

I find it pretty interesting that almost every evaluation written before me is so negative. All in all, I don't believe Professor Aschenbrenner is as horrible as people make him sound. While he does simply do examples from the book, I always found that going to lecture was EXTREMELY HELPFUL. I love the way he draws graphs to illustrate what he is saying (such as with integration and Taylor Polynomials, etc.). I also thought that his explanations in class were clear and concise while bringing a greater understanding to the subject. I would definitely say if you wan to do well in this class to go to both section and lecture as they are extremely helpful. Try and get a Thursday section because some of the homework problems cover sections that won't be covered until AFTER you turn in the homework (which was definitely a downside). His midterms aren't too hard, the mean for both being in the mid to high 50's. BEWARE of the final though - it's RIDICULOUSLY hard. It's cumulative and he doesn't allow any notes, so study hard.