http://twitter.com/math21a

Some Mathematica projects are shown here: http://tinyurl.com/yzjx5gb Some amazing contributions! 11:00 AM Jan 8th from web
Solutions to the final exam are online. 4:59 PM Dec 21st, 2009 from web
Tomorrow, we have the second review at the same time and place (3PM SciC B). ( See http://tinyurl.com/ydvwo2r for the curve problems today) 8:42 PM Dec 9th, 2009 from web
The cold and wet weather of the last days has a nice explanation: see the contour map http://tinyurl.com/yghoxkk . Strong local minima! 4:48 PM Dec 9th, 2009 from web
Practice exams are now posted on the exams page. Too many to do all. Pick topics where you need practice. Solutions come next week. 10:17 AM Dec 3rd, 2009 from web
Please mark your calendar for our global reviews on Wednesday 12/9 and Thursday 12/10, both from 3-4:30 in Science Center Hall B. 10:44 AM Nov 30th, 2009 from web
Hungry for Mathematica introductions? Wolfram has some clips on the page http://tinyurl.com/yzossjm It can help also to get you started 12:54 PM Nov 20th, 2009 from web
On the page http://tinyurl.com/ye6b9ap there is now a modification of the example written during the Mathematica workshop. 12:53 PM Nov 20th, 2009 from web
Check out recent exhibit pages: http://tinyurl.com/yclvgnc Super surfaces, Lady Gaga and a super gaga proof of the fundamental thm algebra. 9:55 AM Nov 10th, 2009 from web
We have a Mathematica workshop on Thursday, November 19th from 7-8:30 PM in Hall D. Mark your calendars. 9:53 AM Nov 10th, 2009 from web
Problem F shows: "randomness beats order". The Monte Carlo method is better than summing up along a regular lattice. 6:53 PM Oct 26th, 2009 from web
Some have asked already about practice exams. They are still adapted to the current semester and will be posted soon. Probably this friday. 7:52 PM Oct 22nd, 2009 from web
In the exhibit http://tinyurl.com/yf3dajr we have an animation to problem 12 on Lagrange. You see the 26= 12 + 8+ 6 critical points. 7:52 PM Oct 22nd, 2009 from web
Computer vision is a very multi disciplinary field http://tinyurl.com/yjp7y5e Problem E http://tinyurl.com/yjuq7ba deals with an aspect. 6:12 AM Oct 16th, 2009 from web
Thanks for filling out the midterm review sheets. We will post a summary soon. Some wish to have more twitter feeds. This is one more....... 8:39 PM Oct 15th, 2009 from web
Homework problems C and D from this week are not in the book. For problem D, CAs can provide more information in problem sessions. 7:50 AM Oct 13th, 2009 from web
An exam solution draft is now on the exams page. If you find any errors in the still rough draft, let us know. Exams are returned Wed/Thu. 9:33 AM Oct 7th, 2009 from web
Don't forget the global review at 7 PM tonight in Science Center Hall C. We will go through the material in 90 minutes and solve problems. 10:59 AM Oct 4th, 2009 from web
What a feast of surfaces: submitted ruled surfaces http://tinyurl.com/yboxgjp and submitted bumpy spheres http://tinyurl.com/yeab6g6 11:01 AM Oct 1st, 2009 from web
Don't forget to submit your problem A solutions. We started rendering the surfaces. 10:06 AM Sep 30th, 2009 from web
The first homework batch of the 4th week contains a creative assignment: http://tinyurl.com/yb4qfzl We hope to make a gallery with the best.    5:38 AM Sep 28th, 2009   from web
Please mark your calendar for a global exam review on Sunday October 4th at 7 PM in Hall B. The exam is on Tuesday, Oct 6th at 7 PM (Hall C) 12:38 PM Sep 24th, 2009 from web
Make use of problem sessions! This week, after two weeks of geometry, we started integrating. Brush up your integration skills! 4:53 AM Sep 23rd, 2009 from web
The registrar has set the final exam date for Exam group 1 for Saturday, December 19'th. See http://tinyurl.com/ma5ng3 6:19 AM Sep 18th, 2009 from web
A Giro helmet was left in the 21a MWC last night. If you miss it, please see Rehana (SC 423). 1:11 PM Sep 17th, 2009 from web
This week, we will use a handout http://tinyurl.com/mvvmhk on distance formulas. This topic is a good opportunity to see cross/dot products 10:35 AM Sep 15th, 2009 from web
An exhibt on the cork plug problem from the first week can be found here: http://tinyurl.com/njf8a4 10:33 AM Sep 15th, 2009 from web
Tuesday/Thursday sections: please remember to turn in the first homework batch (10 problems on Tuesday September 15th. 1:13 PM Sep 14th, 2009 from web
Question: is a student solution manual is necessary? Answer: it is not needed but could be useful. You might want to share one in a group. 4:06 AM Sep 11th, 2009 from web
I should clarify that there are CA's on duty tonight already for 21a but not as many as we usually have. 9:55 AM Sep 10th, 2009 from web
A first reminder: tomorrow is study card day. Make sure you can meet with your freshmen advisor and submit it on time tomorrow. 9:55 AM Sep 10th, 2009 from web
The first class started two min before 09/09/09 09:09:09 yesterday. Today,10/09/09, the MQC is not yet fully staffed. Use office hours. 9:53 AM Sep 10th, 2009 from web
Remember, this Friday, the first 5 problems are due for the Mon/Wed/Fri sections. The TTh sections submit 10 problems on Tuesday 5:19 PM Sep 9th, 2009 from web
Classes start tomorrow for MWF sections and aftertomorrow for TTh sections. Have you seen Harvard on Doonnesbury? http://tinyurl.com/n2t9w8 6:47 PM Sep 8th, 2009 from web
A curious symmetry in the two dimensional plane http://imgur.com/1NjDV.jpg 4:53 AM Sep 8th, 2009 from web
Please only come to the calculus office 308, if you either have no section assignment yet or a serious time conflict prevents you from class 4:30 AM Sep 8th, 2009 from web
The MQC opens on September 10. For more information, look at the MQC page http://tinyurl.com/nqw7gv. 4:12 AM Sep 8th, 2009 from web
There is no HW due the first lecture. MWF sections turn in the first HW (5 problems) on Fri. TTH sections have 10 problems due on Sept 15. 9:14 AM Sep 7th, 2009 from web
http://tinyurl.com/o678yd is a podcast version of the intro meeting slides. 9:59 AM Sep 4th, 2009 from web
You will get your section assignment today. Unrelated: one handout mentioned edition 5 of the book. The website is correct. It is edition 4. 2:56 AM Sep 4th, 2009 from web 
The sectioning deadline looms. Make sure you section until noon today.    7:37 AM Sep 3rd, 2009   from web
Reminder: required intro meeting at 8:30 AM in Science Center C. See you there. 4:18 AM Sep 3rd, 2009 from web
Was a nice convocation. Perfect weather/speeches/music. Tomorrow, September 3rd is the first day of class. Wednesday is the new Monday! 6:31 PM Sep 1st, 2009 from web
Sectioning only needs a few seconds. See http://tinyurl.com/n5dnm5 5:00 PM Aug 31st, 2009 from web
You can now section for this course. Start on the page http://tinyurl.com/muzwpc 4:36 PM Aug 30th, 2009 from web
The mathematics of hurricanes/ tropical storms has a lot to do with multivariable calc. See the exhibit http://tinyurl.com/mtry3p Stay dry. 5:56 PM Aug 29th, 2009 from web
For the math advising schedule, see http://tinyurl.com/muzwpc 5:15 AM Aug 28th, 2009 from web
I quickly visited the textbook section of the Harvard coop and they seem to be well stocked with textbooks for the course. 5:00 PM Aug 27th, 2009 from web
Welcome back on campus! If you are interested in this course, come to the introductory meeting Thu/Sep 3, SC C, 8:30 AM 5:41 AM Aug 27th, 2009 from web
If you shop for the book and the Harvard coop is out of books, try http://tinyurl.com/kuvqhf 11:30 AM Aug 26th, 2009 from web
See http://tinyurl.com/ns74ve for the course website. 8:22 AM Aug 26th, 2009 from web
Welcome to Harvard Multivariable Calculus 7:57 AM Aug 26th, 2009 from web