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MATH 31B

Integration and Infinite Series

4 units

Sections & times

Lecture and discussion. The registrar has published a final exam time.

Fall 2026: 4 lectures and 24 discussions. 2 lectures and 5 discussions are open. The oldest of these readings was 5 hours ago.

Grades

3.08

Average grade awarded in MATH 31B. Not a student rating: this is what the grades were.

In the A range

47%

of the 6,721 letter grades

D, F or W

8.3%

of every letter grade awarded, plus withdrawals

Taken pass/no pass

<1%

39% of those passed

The registrar's own records: 6,721 grades over 15 terms, Fall 2021 to Fall 2025. Every instructor is pooled here.

What is inside that record

3 of those terms are summer sessions, and summer sessions are counted here.

The table below splits them, and term averages across those 15 terms ran 2.81 to 3.77.

Historical grades for GU, HAOTIAN, across recorded terms. The course summary above includes all professors.

  • A+ 18 · 8.9%
  • A 57 · 28.1%
  • A- 12 · 5.9%
  • B+ 19 · 9.4%
  • B 19 · 9.4%
  • B- 16 · 7.9%
  • C+ 12 · 5.9%
  • C 16 · 7.9%
  • C- 5 · 2.5%
  • D+ 6 · 3.0%
  • D 6 · 3.0%
  • D- 2 · 1.0%
  • F 15 · 7.4%

Percentages are of the 203 letter grades. Grey bars are non-letter outcomes.

How the non-letter outcomes are counted

They are excluded from the GPA entirely rather than scored, because counting a P as a 4.0 would be a fabrication.

By instructor

Predicted GPA, raw average, sample size, terms, A range and the workload reviewers reported for every instructor with a grade record in this course
Instructor Predicted GPA Raw n Terms A range Workload Fall 2026
SANCHEZ OCAL, PABLO reviews ↗ 3.10 3.10 751 3 41% light not teaching it
XIONG, HAOREN reviews ↗ 2.91 2.90 674 2 35% light not teaching it
ARANT, TYLER JAMES reviews ↗ 2.80 2.80 601 3 39% very light not teaching it
GREENE, MARY PAIGE reviews ↗ 3.56 3.57 551 4 74% - not teaching it
JOHNSON, CASEY LYNN reviews ↗ 2.62 2.60 450 3 36% light not teaching it
GANNON, KYLE ANDREW COX reviews ↗ 3.69 3.72 437 1 78% very light not teaching it
BEERS, DAVID reviews ↗ 3.29 3.30 426 2 57% very light not teaching it
DING, CHANGYING reviews ↗ 3.15 3.15 417 2 49% very light not teaching it
LI, LINFENG reviews ↗ 3.19 3.20 413 2 43% light not teaching it
FLYNN, PATRICK reviews ↗ 3.35 3.37 212 1 65% very light not teaching it
KERANEN, JUKKA PETRI MIKAEL reviews ↗ 2.96 2.95 209 1 40% very light not teaching it
BADREDDINE, RANA reviews ↗ 3.07 3.07 206 1 42% - not teaching it
MIN, HYUNKI reviews ↗ 3.11 3.11 203 1 44% very light not teaching it
ZHANG, ZHAOYU reviews ↗ 2.76 2.73 203 1 29% very light not teaching it
GU, HAOTIAN reviews ↗ 2.92 2.91 203 1 43% - Open, 2 seats left
DEMIROGLU, YESIM reviews ↗ 2.94 2.93 200 1 36% - not teaching it
SCAVIA, FEDERICO reviews ↗ 3.16 3.17 197 1 49% light not teaching it
MARKS, ANDREW SCOTT reviews ↗ 2.65 2.61 182 1 32% very heavy not teaching it
GREENE, ROBERT E reviews ↗ 2.85 2.82 150 1 28% average not teaching it
CONLEY, WILLIAM JOSEPH reviews ↗ 2.19 1.78 36 1 11% average not teaching it
Why Predicted is not the Raw average

“Predicted” is shrunk toward the course average, which is itself shrunk toward the department, so an instructor with a handful of students sits near the course mean rather than topping the list.

Grade records describe outcomes. For what a course is like to take, read student reviews written on dibs below or follow the separate external review link.

Reviews for MATH 31B

Workload and assignments

Work types reported in BruinWalk reviews of this course, across recorded instructors and terms. They may differ from this term's syllabus.

What the work looks like

  • 2 exams, said by 7 reviewers
  • 3 quizzes, said by 3 reviewers
  • Problem sets mentioned, no number given, said by 6 reviewers

Read from 818 reviews 26 days ago. dibs counts only what a review actually states, so a kind of work nobody mentioned is absent rather than zero.

Read the source reviews

What comes first

The chain dibs can see is 2 courses long before MATH 31B. dibs has read a class page for every course in it.

Counted in courses rather than quarters: dibs does not know which of them a department lets you take together.

In Falls

Ran in 5 of the last 5 Falls.

From the terms dibs holds, which start in Fall 2021 and exclude summer. A department can run a course in a quarter it never has before.

From the registrar's catalog

Lecture, three hours; discussion, one hour. Requisite: course 31A with grade of C- or better. Not open for credit to students with credit for course 3B. Transcendental functions; methods and applications of integration; sequences and series. P/NP or letter grading.

Sections in Fall 2026

You enroll in the discussion, not the lecture, so a discussion's status is the one that decides whether you get in. A lecture can read open while every discussion under it is full.

Seat counts as of : the oldest of these 28 readings. Seat readings are snapshots, not live availability. Their timestamps show when dibs last checked.

Final enrollment, averaged across each term's sections: between 144 and 281 a term over 12 terms, summer excluded, most recently 208 in Fall 2025. That is the shape across years, not this term, which is above.

From the people who took it

Student reviews

What taking MATH 31B was like: the work, the teaching, and what students wish they’d known.

Write a review

Your experience could be the first.

No student reviews are available to read on dibs for this course yet. Took it? Tell the next person what helped, what was hard, and how you spent your time.

Looking for more perspectives?

External reviews are separate and do not count toward the dibs rating.

Read reviews on BruinWalk

Community guidelines

Seats over time in Fall 2026

How each lecture has filled since dibs first saw it. This course runs 4 lectures; the legend under the chart picks one.

A dot is a reading where something moved: the seat count, the status, or the waitlist.

What a flat run means, and where a line starts

Flat between dots means it did not drift, it held and then jumped, and a line starts when dibs first saw that lecture rather than reaching back before it existed. A lecture that has never moved draws a flat line across the whole window, and one with two or three readings draws a line joining them, which is too few to read a trend from.

Lec 1 · Gu, H. · 208 of 210 enrolled

Filled by 59 over about 2 months

208 of 210 · 2 left in its discussions
17 Aug 15:079 Sep 08:492 Oct 02:32
dibs read 168 of the 176 hours its hourly record covers, 95%, and did not look in 8. dibs had no hourly record before 24 Sep, which is the other 916 of 1092 plotted.208 of 210 enrolled at the newest reading, 56 minutes ago, with 2 left in its discussions. Seats from 17 Aug 15:07 to 2 Oct 02:32, 149 to 208. dibs read 168 of the 176 hours its hourly record here covers, 95%. An hour marked as read confirms a check, not continuous monitoring. That check recorded no change; changes between checks may be missed. For 8 hours dibs was keeping a record and did not reach this section. Nothing before 24 September at 19:00, where this section's record starts, has a read either way, which is 916 hours of this window. Where the drawing is faint or broken, that never means the readings are doubtful. It means the stretch between them is unaccounted for.

Lec 2 · Gu, H. · 140 of 140 enrolled

Filled by 86 over about 2 months

140 of 140 · no seats left in its discussions
17 Aug 15:079 Sep 08:492 Oct 02:32
dibs read 168 of the 176 hours its hourly record covers, 95%, and did not look in 8. dibs had no hourly record before 24 Sep, which is the other 916 of 1092 plotted.140 of 140 enrolled at the newest reading, 56 minutes ago, and no seats left in its discussions. Seats from 17 Aug 15:07 to 2 Oct 02:32, 54 to 140. dibs read 168 of the 176 hours its hourly record here covers, 95%. An hour marked as read confirms a check, not continuous monitoring. That check recorded no change; changes between checks may be missed. For 8 hours dibs was keeping a record and did not reach this section. Nothing before 24 September at 19:00, where this section's record starts, has a read either way, which is 916 hours of this window. Where the drawing is faint or broken, that never means the readings are doubtful. It means the stretch between them is unaccounted for.

Lec 3 · Wang, A.Y. · 210 of 210 enrolled

Filled by 77 over about 2 months

210 of 210 · no seats left in its discussions
17 Aug 15:079 Sep 08:492 Oct 02:32
dibs read 168 of the 176 hours its hourly record covers, 95%, and did not look in 8. dibs had no hourly record before 24 Sep, which is the other 916 of 1092 plotted.210 of 210 enrolled at the newest reading, 56 minutes ago, and no seats left in its discussions. Seats from 17 Aug 15:07 to 2 Oct 02:32, 133 to 210. dibs read 168 of the 176 hours its hourly record here covers, 95%. An hour marked as read confirms a check, not continuous monitoring. That check recorded no change; changes between checks may be missed. For 8 hours dibs was keeping a record and did not reach this section. Nothing before 24 September at 19:00, where this section's record starts, has a read either way, which is 916 hours of this window. Where the drawing is faint or broken, that never means the readings are doubtful. It means the stretch between them is unaccounted for.

Lec 4 · Wang, A.Y. · 206 of 210 enrolled

Filled by 119 over about 2 months

206 of 210 · 4 left in its discussions
17 Aug 15:079 Sep 08:492 Oct 02:32
dibs read 168 of the 173 hours its hourly record covers, 97%, and did not look in 5. dibs had no hourly record before 24 Sep, which is the other 919 of 1092 plotted.206 of 210 enrolled at the newest reading, 56 minutes ago, with 4 left in its discussions. Seats from 17 Aug 15:07 to 2 Oct 02:32, 87 to 206. dibs read 168 of the 173 hours its hourly record here covers, 97%. An hour marked as read confirms a check, not continuous monitoring. That check recorded no change; changes between checks may be missed. For 5 hours dibs was keeping a record and did not reach this section. Nothing before 24 September at 22:00, where this section's record starts, has a read either way, which is 919 hours of this window. Where the drawing is faint or broken, that never means the readings are doubtful. It means the stretch between them is unaccounted for.
How readings and alerts work

A reading and an hourly record are different things, and most charts here hold more of the second missing than present. dibs has taken readings of a section since long before it began keeping an hour-by-hour log of when it looked, so the empty stretches are dibs saying it was not keeping that log yet, not that it looked and found nothing. That is the age of the record and not a fault.

Seat counts show the last successful read, not live availability. Refreshes can be delayed by request limits or upstream interruptions. Watched sections receive priority, but an hourly update for every section is not guaranteed.

The registrar can change a seat count between our checks. Alerts depend on dibs detecting an opening and completing delivery; a quiet watch does not prove that no seat opened. Check the registrar before enrolling.