Calculus of functions of several variables, vector valued functions of one variable, derivative and integrals of vector functions, double and triple integrals, properties and applications of integrals, change of variables.

Prerequisites: Mathematics 4A (or 4AI) with a letter grade of C or better.

4

Units

Optional

Grading

1

Passtime

Undergraduate students only

Level Limit

Letters and science

College
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PENG QIRUI
Qirui Peng
4.6
8 reviews
AI predicted, based on past grading trends of the course and instructor, class info, and 127 other factors
HSSB 2251
T
08:00 AM - 08:50 AM
0 / 25
HSSB 2251
T
17:00 PM - 17:50 PM
0 / 25
HSSB 2251
T
18:00 PM - 18:50 PM
0 / 25
LSB 1101
T
19:00 PM - 19:50 PM
0 / 25
GIRV 2120
R
17:00 PM - 17:50 PM
0 / 25
HSSB 2251
R
18:00 PM - 18:50 PM
0 / 25
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Winter 2026 . Peng Qirui
LSB 1001
M W F
08:00 AM - 08:50 AM
Winter 2024 . Shah S
TD-W 1701
T R
15:30 PM - 16:45 PM
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MATH 6A El-Hasan H M Fall 2025 Total: 143
MATH 6A Hosseinkhan A Fall 2025 Total: 82
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8
4.6
MATH117 . Peng Qirui 4 Months Ago

Analysis is a really hard subject and despite having 117 as a prereq for 118, it still is a really hard intro. His lectures are ok, and not very informational. Office hours would be better suited for this. It's a hard class so get used to putting in much more effort than other classes to really understand the material.

0 helpful 0 unhelpful
Math3B . Peng Qirui 9 Months Ago

Very easy midterms, basically just the practice midterms with different numbers. Lectures can sometimes be hard to understand, but he's very helpful if you ask questions during office hours or after lecture. Very generous weighting due to lowest midterm score being dropped and homework was worth 40%.

0 helpful 0 unhelpful
Math3B . Peng Qirui 9 Months Ago

The homework was 40% of the grade so it helps out a lot. The tests are basically copies of the practice tests but he changes the questions slightly. Super east first mid term and hard second one. Final wasn't bad. He is nice in person and will help a lot in office hours.

0 helpful 0 unhelpful
Math3B . Peng Qirui 10 Months Ago

He's a chill guy. His lectures were a little hard for me to follow cuz he moves a bit fast so pay attention. Never went to OH or sections. Exams are easy and straightforward as long as you do the practice exams. He says he doesn't curve but I calculated my final grade and I should've gotten a A- but he gave me an A.

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Math3B . Peng Qirui 10 Months Ago

Qirui Peng is a chill and jolly guy but once we got to infinite series he fell off and i js stopped going to lecture altogether. His tests are very easy and straightforward and his grading is extremely fair. I never went to his office hours but I am sure that if you go then you will be just fine. I learned everything on youtube.

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Math3B . Peng Qirui 10 Months Ago

Hw is hard so make sure to attend his OH. Also, he's incredibly friendly and intelligent so just talk to him he's chill. Exams r easy because he always provides samples and additional practice questions that prepare u very well. Lectures are good too and even if u can self teach, they're still useful. Overall very good professor.

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