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MATH 31A · Lec 4

Differential and Integral Calculus

Fall 2026Chen, H.4 units

Seats, time, final and grades

Seats

Open, 18 seats left.

126 of 140 enrolled, lecture and all discussions summed.

Subtract those two and the lecture has 14 places in it. The 18 seats above are what is open in the discussions, and you enroll in a discussion, so that is the figure that decides whether you get in.

Meets

MWF 4:00pm-4:50pm

Lecture only. You also attend a discussion, listed below.

Final

Tue 8 Dec, 6:30pm to 9:30pm

One exam for the whole class, Los Angeles time.

Read 4 days ago.

Grades

3.23
predicted, all instructors · 4,717 grades

4,717 letter grades, everyone who has taught MATH 31A.

Read 2 hours ago. The latest refresh is overdue. Seats and instructors may have changed since. Check the registrar before enrolling.

Enroll on the registrar (opens in a new tab) Sign in to watch for an opening

Watching is the one thing here that needs an account, because an alert needs somewhere to go. Everything else on this page works signed out.

Put this class on a board

A board is one quarter you are drafting, so it needs an account to live in. Signing in brings you straight back to this page, with this class still in front of you.

Before you can enroll

Tell dibs what you have already taken and this line will say which of these you have. Your list.

From the registrar limited early, then open

Information on the Mathematics Diagnostic Test and Advanced Placement (AP) credit is available at https://uclamathugrad.zendesk.com/ . Seats are held for entering students who enroll through New Student Orientation sessions beginning July 2, 2026. New student restrictions will be lifted on September 15, 2026 at 8 a.m. Enrollment is contingent on taking and passing the Mathematics Diagnostic Test. There will be two MANDATORY midterm examinations from 6 to 7:50 p.m. on the following Wednesdays: October 21 and November 18, 2026.

The limit stands until 15 September, and lifts then. dibs still counts this class as one you can take, but not yet.

Restrictions read 4 days ago. dibs re-reads these slowly because they rarely change; watch the section and it moves to every 6 hours.

Discussions

You enroll in the discussion, not the lecture, so the seat figure above is the sum across all of them and can read open while every discussion you could actually join is full.

6 discussions, 3 open: Dis 4A, T 4:00pm-4:50pm, Dis 4B, R 4:00pm-4:50pm, and Dis 4D, R 4:00pm-4:50pm.

  • Dis 4A

    T 4:00pm-4:50pm

    Gluchowski, M.

    Open, 1 seat left.

  • Dis 4B

    R 4:00pm-4:50pm

    Gluchowski, M.

    Open, 9 seats left.

  • Dis 4C

    T 4:00pm-4:50pm

    Zhou, J.

    Waitlist, 0 of 3 places taken.

  • Dis 4D

    R 4:00pm-4:50pm

    Zhou, J.

    Open, 8 seats left.

  • Dis 4E

    T 4:00pm-4:50pm

    An unnamed TA

    Closed by the department.

  • Dis 4F

    R 4:00pm-4:50pm

    An unnamed TA

    Closed by the department.

When it meets

Mon
Tue
Wed
Thu
Fri
6am
7am
8am
9am
10am
11am
12pm
1pm
2pm
3pm
4pm
5pm
6pm
7pm
8pm
9pm
10pm

Meets: MWF 4:00pm-4:50pm

Discussions: T 4:00pm-4:50pm · R 4:00pm-4:50pm

Mathematical Sciences 4000A

Grades

3.23
predicted, all instructors · 4,717 grades

Of the 17 people in the grade record for MATH 31A, the 2 with the most grades: GANNON, THOMAS ANTHONY at 3.50 over 636 grades and WU, JEREMY SHEUNG HIM at 3.06 over 478 grades.

A range
57%
P/NP
1%
D/F/W
8.0%

Full grade history for MATH 31A

What students say

dibs measures outcomes: grades, seats, how fast it fills. For what the class is actually like to sit in, BruinWalk has the reviews.

dibs has read this course’s reviews and none of them say what kind of work it sets, so dibs has nothing to show rather than a guess. Read from 592 reviews 26 days ago. That is the reviewers being silent, and not a course that sets no work.

Reviews for MATH 31A Search the reviews for H. Chen

Will it still be here

high risk chance of closing before your enrollment pass.

Final enrollment per term from four years of grade data. Summer excluded: different population, different pass structure.

  • 20221F
  • 28222W
  • 21522F
  • 28523W
  • 18723S
  • 19223F
  • 17624W
  • 18824F
  • 19325W
  • 18625F
Enrollment by term: 21F 202, 22W 282, 22F 215, 23W 285, 23S 187, 23F 192, 24W 176, 24F 188, 25W 193, 25F 186

Peak 285 · most recent 25F at 186

Seats over time

Nothing read since 1 Oct, 2 hours ago. Over about 2 months before that, filled by 81.

126 of 140 · 18 left in its discussions
17 Aug 15:079 Sep 06:341 Oct 22:02 · 2 hours ago
dibs read 168 of the 698 hours its hourly record covers, 24%, and did not look in 530. dibs had no hourly record before 2 Sep, which is the other 390 of 1088 plotted.126 of 140 enrolled at the newest reading, 2 hours ago, with 18 left in its discussions. Seats from 17 Aug 15:07 to 1 Oct 22:02, 45 to 126. dibs read 168 of the 698 hours its hourly record here covers, 24%. An hour marked as read confirms a check, not continuous monitoring. That check recorded no change; changes between checks may be missed. For 530 hours dibs was keeping a record and did not reach this section. Nothing before 2 September at 21:00, where this section's record starts, has a read either way, which is 390 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.

A dot is a reading where something moved: the seat count, the status, or the waitlist. Flat between dots joins recorded counts; changes between reads may be missed. The line starts when dibs first saw this section rather than reaching back before it existed. The last one is the last time dibs read this section, moved or not, and that was 2 hours ago. It is where the line stops, not where the count is now.

Show the readings (58)
Recorded Enrolled Capacity Status Waitlist Hours read
1 Oct 22:02 126 140 open 0 of 12 1 of 1
1 Oct 22:02 126 140 open 0 of 12 2 of 5
1 Oct 18:32 127 140 open 0 of 12 6 of 19
1 Oct 00:02 126 140 open 0 of 12 3 of 8
30 Sep 17:02 127 140 open 0 of 12 5 of 16
30 Sep 02:02 129 140 open 0 of 12 2 of 5
29 Sep 22:32 128 140 open 0 of 12 8 of 25
28 Sep 22:02 127 140 open 0 of 12 2 of 5
28 Sep 18:32 126 140 open 0 of 12 2 of 4
28 Sep 15:02 127 140 open 0 of 12 20 of 68
25 Sep 20:02 126 140 open 0 of 12 3 of 8
25 Sep 13:02 125 140 open 0 of 12 5 of 16
24 Sep 22:52 124 140 open 0 of 12 2 of 4
24 Sep 19:22 123 140 open 0 of 12 2 of 5
24 Sep 15:52 122 140 open 0 of 12 2 of 4
24 Sep 12:22 120 140 open 0 of 12 3 of 8
24 Sep 05:22 118 140 open 0 of 12 4 of 13
23 Sep 17:52 116 140 open 0 of 12 2 of 4
23 Sep 14:42 115 140 open 0 of 12 7 of 22
22 Sep 17:52 116 140 open 0 of 12 5 of 15
22 Sep 03:42 112 140 open 0 of 12 2 of 5
21 Sep 23:22 113 140 open 0 of 12 2 of 5
21 Sep 19:52 111 140 open 0 of 12 2 of 4
21 Sep 16:22 113 140 open 0 of 12 3 of 8
21 Sep 09:22 111 140 open 0 of 12 3 of 9
21 Sep 01:12 110 140 open 0 of 12 11 of 36
19 Sep 14:32 111 140 open 0 of 12 5 of 14
19 Sep 01:32 110 140 open 0 of 12 3 of 8
18 Sep 18:32 109 140 open 0 of 12 8 of 26
17 Sep 17:02 109 210 open 0 of 12 3 of 8
17 Sep 10:02 108 210 open 0 of 12 9 of 30
16 Sep 05:12 107 210 open 0 of 12 2 of 5
16 Sep 01:32 106 210 open 0 of 12 2 of 6
15 Sep 20:52 107 210 open 0 of 12 2 of 5
15 Sep 16:12 108 210 open 0 of 12 2 of 5
15 Sep 12:42 107 210 open 0 of 12 25 of 84
12 Sep 01:22 108 210 open - 2 of 3
11 Sep 23:02 106 210 open - 3 of 6
11 Sep 18:40 108 210 open - 3 of 16
11 Sep 03:40 94 210 open - 2 of 8
10 Sep 20:40 95 210 open - 4 of 23
9 Sep 22:40 95 196 open - 4 of 22
9 Sep 01:40 81 196 open - 2 of 8
8 Sep 18:40 80 196 open - 9 of 85
5 Sep 06:40 80 181 open - 8 of 37
3 Sep 18:40 63 181 open - 6 of 42, 20 no hourly record
2 Sep 01:40 63 167 open - no hourly record
1 Sep 02:40 61 167 open - no hourly record
26 Aug 00:40 62 167 open - no hourly record
25 Aug 23:40 53 167 open - no hourly record
25 Aug 22:40 62 167 open - no hourly record
25 Aug 21:40 53 167 open - no hourly record
25 Aug 20:40 62 167 open - no hourly record
24 Aug 15:41 53 167 open - no hourly record
21 Aug 00:40 53 152 open - no hourly record
20 Aug 17:40 50 152 open - no hourly record
19 Aug 21:40 45 152 open - no hourly record
17 Aug 15:07 45 137 open - -
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.

Class chat

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