First and second order differential equations, separation of variables, linear differential equations, systems of first order equations, nonlinear differential equations and stability.

Prerequisites: Math 4A or Math 4AI with a minimum grade of C.

4

Units

Optional

Grading

1

Passtime

Undergraduate students only

Level Limit

Letters and science

College
Unlocks CH E 110B CH E 132A EARTH 135 EARTH 133 EARTH 134 ECE 130C
These majors only math cmpsc ece me phys stats cneng crstu
YANG XU
XU Yang
2.7
36 reviews
AI predicted, based on past grading trends of the course and instructor, class info, and 127 other factors
SH 1609
W
08:00 AM - 08:50 AM
23 / 25

LSB 1101
W
12:00 PM - 12:50 PM
25 / 25 Full

ILP 3205
W
16:00 PM - 16:50 PM
24 / 25

HSSB 2251
W
17:00 PM - 17:50 PM
24 / 25

BUCHN1934
W
18:00 PM - 18:50 PM
24 / 25

BUCHN1934
W
19:00 PM - 19:50 PM
22 / 25

See All
Winter 2026 . Yang F
TD-W 1701
T R
08:00 AM - 09:15 AM
Winter 2024 . Zhang Q
LSB 1001
M W F
10:00 AM - 10:50 AM
See All
MATH 4B Yang F Fall 2024 Total: 137
MATH 4B Chiang H Fall 2025 Total: 145
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36
2.7
MATH4B . Yang Xu 7 Days Ago

Pretty bad lecturer and the slides he has posted are from previous years and don't always match up with what he covered in class. There are two midterms, lowest is dropped. Lowest homework is dropped. Midterms and the final were really easy though. Easy class but poor prof IMO.

0 helpful 0 unhelpful
MATH4B . Yang Xu 8 Days Ago

His lectures were pretty scattered and not super worth going to. He also writes out a bunch of problems and concepts but his handwriting is almost completely illegible. I had to teach myself almost all of it but the TAs had very useful resources.

0 helpful 0 unhelpful
MATH4B . Yang Xu 8 Days Ago

He wasn't the worst that's for sure. In fact his lectures were good for the first half of the course. His lectures at the very end were kind of all over the place. His tests were pretty fair, but he constantly didn't follow the lecture slides and was unclear about certain expectations. It's a test heavy class, but doable.

0 helpful 0 unhelpful
MATH4B . Yang Xu 10 Days Ago

Stopped going to lecture after week 2 because I couldn't understand a word he said. Has a thick accent, mumbles, and his handwriting is illegible. The only good thing about this class was the TAs and the slides they posted bc all the slides from the prof were entirely unhelpful. Tests were super easy but you won't actually learn anything.

0 helpful 0 unhelpful
MATH4B . Yang Xu 12 Days Ago

easy a, i've never seen easier math tests before

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MATH4B . Yang Xu 12 Days Ago

Honestly not too bad. His handwriting kind of sucks, but if you show up to every lecture you can get a pretty good idea of what's going on. Graded by 2 midterms (with one score dropped) and a final, which ended up being a copy paste of said midterms. Just show up to every lecture and it's a pretty easy class.

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See all 36 reviews
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