Introduction to methods of proof in analysis. topics include limits, sequences and series, continuity, compactness, as well as other topics. This course is intended to follow Mathematics 8 and to introduce students to the level of sophistication of upper-division mathematics.

Prerequisites: Mathematics 8 or PSTAT 8 with a grade of "C" or better.

4

Units

Optional

Grading

1

Passtime

None

Level Limit

Letters and science

College
Unlocks MATH 104A MATH 118A MATH 145
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PENG QIRUI
Qirui Peng
4.6
7 reviews
AI predicted, based on past grading trends of the course and instructor, class info, and 127 other factors
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Fall 2025 . Peng Qirui
NH 1105
M W F
10:00 AM - 10:50 AM
Spring 2026 . Peng Qirui
TD-W 2600
M W F
10:00 AM - 10:50 AM
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MATH 117 Peng Qirui Fall 2025 Total: 45
MATH 117 Agboola A Winter 2026 Total: 34
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7
4.6
Math3B . Peng Qirui 3 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%.

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Math3B . Peng Qirui 3 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.

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Math3B . Peng Qirui 4 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 4 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 4 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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Math3B . Peng Qirui 4 Months Ago

he is so cute and sweet and super passionate about math. his lectures contain a lot of heavy material and his homework is quite difficult, which may seem scary at first, but his actual exams are a lot easier. his sample midterms are exactly like the actual midterms which is so helpful. his A- cutoff is 85% instead of the usual 90% thank you🙏🙏🙏🙏

2 helpful 0 unhelpful
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