MATH 120A
Differential Geometry
Description: Lecture, three hours; discussion, one hour. Requisites: courses 32B, 33B, 115A, 131A. Course 120A is requisite to 120B. Curves in 3-space, Frenet formulas, surfaces in 3-space, normal curvature, Gaussian curvature, congruence of curves and surfaces, intrinsic geometry of surfaces, isometries, geodesics, Gauss/Bonnet theorem. P/NP or letter grading.
Units: 4.0
Units: 4.0
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Most Helpful Review
This was an interesting class. First of all, it is a class for pure math majors, yet they make math for teaching majors take it as well. That being said, Petersen is a great professor. He is clear and concise about explaining the material. It was not Petersen I had a problem with, it was the material. Most math classes I have been able to idly sit by and not study too much until the final...but this one really whipped me into shape. The HW grader was extremely harsh, so most people got between a 5 and a 7 on all homeworks. If you put a good deal of work into the class, it is easily manageable. He gives reviews before each test and recommends which problems you study from the homework before each exam...I'd say from the 10 questions on the final, 3 were on a final review sheet, 2 were from homework, 3 were simple applications from what we'd seen in class, and there were 2 harder questions. If you don't have to take 120a, then do not, by any means, take it. However, if it is required for your major, take it with Petersen. Just prepare for a hard-working quarter.
This was an interesting class. First of all, it is a class for pure math majors, yet they make math for teaching majors take it as well. That being said, Petersen is a great professor. He is clear and concise about explaining the material. It was not Petersen I had a problem with, it was the material. Most math classes I have been able to idly sit by and not study too much until the final...but this one really whipped me into shape. The HW grader was extremely harsh, so most people got between a 5 and a 7 on all homeworks. If you put a good deal of work into the class, it is easily manageable. He gives reviews before each test and recommends which problems you study from the homework before each exam...I'd say from the 10 questions on the final, 3 were on a final review sheet, 2 were from homework, 3 were simple applications from what we'd seen in class, and there were 2 harder questions. If you don't have to take 120a, then do not, by any means, take it. However, if it is required for your major, take it with Petersen. Just prepare for a hard-working quarter.
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Most Helpful Review
Spring 2024 - I enjoyed the content of this course, and I thought the course was well-organized and enjoyable overall. Lectures were a bit dry, and the professor seemed unconfident (despite rarely making any actual mistakes). However, they were clear and easy to follow as well. I enjoyed the homework, and thought exams were fair. I would have enjoyed it if the class were a bit less computational and a bit more proof based.
Spring 2024 - I enjoyed the content of this course, and I thought the course was well-organized and enjoyable overall. Lectures were a bit dry, and the professor seemed unconfident (despite rarely making any actual mistakes). However, they were clear and easy to follow as well. I enjoyed the homework, and thought exams were fair. I would have enjoyed it if the class were a bit less computational and a bit more proof based.
Most Helpful Review
Spring 2020 - I thought the course material was fairly straightforward, and Prof. Willis certainly helps make it even more so. He's a clear lecturer and he's always willing to take questions during lecture, help out during office hours, and take suggestions from students about the course structure, which was key since Spring 2020 was remote/online. The overall grade is: weekly homework (20%), two midterms (20% each), and the final (40%). Exams were fair, possibly even more so than the homework assignments, each of which always seemed to have one really tough problem. In general, I'd definitely recommend taking 120A with Willis.
Spring 2020 - I thought the course material was fairly straightforward, and Prof. Willis certainly helps make it even more so. He's a clear lecturer and he's always willing to take questions during lecture, help out during office hours, and take suggestions from students about the course structure, which was key since Spring 2020 was remote/online. The overall grade is: weekly homework (20%), two midterms (20% each), and the final (40%). Exams were fair, possibly even more so than the homework assignments, each of which always seemed to have one really tough problem. In general, I'd definitely recommend taking 120A with Willis.
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