What do you use to animate your videos?
I create most of the animations programmatically, using a python library named "manim" that I've been building up. I’ve also used Grapher for a number of 3d animations.
Everything is open-source on github, and a small community has emerged of people who use it, but before you dive in I feel like a warning is in order. This is something I’ve put together with my own use case in mind, never really meant to be a professional product that’s consistently maintained for others. It's not that I want to discourage others from doing similar things, quite the contrary I love when that happens, but often my workflow and development with manim can make it more difficult for an outsider to learn than other better-documented animation libraries, like Matplotlib or Mathematica.
I also get worried when I hear people ask things like “how do I sync up narration into manim”. This is just a tool for spitting out the individual mathematical animations, not the whole video. For goodness sake, use traditional video editing software for as much as you can!
There are aspects of producing videos with a self-made tool like this that I find quite pleasing, but which are pleasing precisely because it's my own. It enforces a uniqueness of style, for example, which is by its very nature a benefit that can't be shared. There's also a certain freedom in being able to tear up the guts of the tool every now and then when I feel a change is in order, since backward compatibility needs are very limited when you only care about videos moving forward. Not exactly the best practice from a collaborative standpoint.
Will you please make a video on ______ !?!
There are so many topics I'd like to cover. And people seem to love writing emails/comments to make requests. Keep in mind, I will make judgments on what to cover next based on what I think has the best chance of deepening people’s relationship with math, and what I am personally most excited to describe. Sometimes there's a worthy topic which I just don't think I have an original or captivating enough way to approach.
Of course, I don't want to completely ignore requests, so your best chance of putting them in a place that I'll keep track of is the reddit thread linked above. This is not a checklist of what I'll necessarily do next, it's just a way to keep a pulse on what people are asking for, and how others respond to each request.
Also, if your request is one from multivariable calculus (e.g. Lagrange multipliers, the Jacobian, Stokes’ theorem, etc.), there’s a good chance I covered it in some of my work at Khan Academy, either in video or article form.
Note, requests I get through email are just about guaranteed to be ignored, since that reddit thread is where I look when considering what people are asking for and how others respond to each request with upvotes and comments.
What does the name "3blue1brown" mean?
Okay, I’m not going to pretend this isn’t a little weird. I made the logo to be a loose depiction of my right eye color: It has sectoral heterochromia, 3/4 blue 1/4 part brown. It was a way of putting a genetic signature on my work, and the channel is all about seeing math in certain ways. The name, of course, is just derived from the logo. In hindsight, this feels a bit more self-centered than I’d like, but hey, what can you do?
What's the music playing in your videos?
Most music has been by written by Vince Rubinetti, which you can download on Bandcamp and stream on Spotify, Apple Music, and Google Play. The piano song throughout the Linear Algebra and Calculus series, which Vince listed as “Grant’s etude” and “Grant’s Opus” on the album, are little snippets that I wrote myself.
Can I translate your videos?
That’d be lovely, thanks! YouTube has some built-in tools to let people contribute subtitles, which is hugely helpful. Really, I can’t tell you what great affection I feel for those who take the time to do those translations. Once you submit a translated transcript, it needs to be approved, which also happens through the community. So reviewing submitted subtitles is also a great way to help.
Since YouTube is not available in China, there is a small team of volunteers that make them available on Bilibili with Chinese translations. You can find the means of contacting the team on that page if you want to help out.
Perhaps you’re wondering about dubbing content. This, unfortunately, takes significantly more time, which most people dramatically underestimate. Also, in some initial experiments with a Spanish channel, they don’t reach meaningfully more people than the subtitled versions on the original videos. Nevertheless, if you do want to put in all that time, and feel like you can commit to more than just one video, I’ll set up an alternate 3b1b channel where we can upload them. Just let me know once you have created one.
Current channels with some dubbed content:
You are not allowed to re-upload the content on your own channel, and such re-uploaded content will be taken down as a copyright violation. I know that might seem harsh, and that many re-uploaded dubbed videos are done in good faith trying to spread math around the world. However, I do need to be able to have some level of agency on how the lessons put out under this name are presented. To take one potential problem, there is otherwise no mechanism for preventing the insertion of unwanted promotional or sponsored additions, or other sorts of edits I wouldn’t approve of.
What resources did you use when learning math? Do you have any recommendations?
Much depends on what you want to learn in particular. As an early high school student, I found the Art of Problem Solving website and books fascinating and transformative, and I think their resources would be just as good for any adult looking to learn more. In general, I do think the best way to learn is to emphasize solving problems, rather than reading/watching alone. Math is fundamentally about patterns, and solving problems is a good forcing function for immersing yourself in patterns. Brilliant does a great job with this approach, and the people I know there are all very thoughtful about approaches to learning and education.
For those in college, here's a selection of books I found particularly well-written.
"Vector Calculus, Linear Algebra, and Differential Forms" by Hubbard and Hubbard
"Linear algebra done right" by Sheldon Axler
"Ordinary Differential Equations" by Vladimir Arnold
"Chaos and Nonlinear Dynamics" by Steven Strogatz
"Visual Complex Analysis" by Tristan Needham
The expository papers written by Keith Conrad
"An Epsilon of Room" by Terry Tao
"Primes of the form x^2 + ny^2" by David Cox
"Topology" by Munkres
"The Cauchy-Schwarz Master Class" by J. Michael Steele
"Proofs from the Book" by Aigner and Ziegler
In reading, really try to predict what proofs will look like, and be willing to meditate on what the right way to think about a given object is. Ask yourself if each new construct feels motivated, or if it's out of the blue. If it is out of the blue, it's okay to move forward anyway, just keep note of the fact that there is a lurking question mark. Read with a pencil and paper by your side so you can sketch things out and scribble solutions to exercises as you come across them.
I hope that helps.
Can you answer a math question for me?
I’d prefer that you post it to the 3b1b subreddit. That way, even if I’m too busy to answer (or if I don’t know!), there’s a good chance someone else will help you. You should also post it to the the math stack exchange, or to Quora, where you’ll be exposed to many, many great minds who are eager to help you out.
I’ve solved a famous unsolved math problem/I’ve developed a novel idea. Will you check it for me?
There are two important things to note here: 1) I’m not a research mathematician, so I wouldn’t be the one to ask. 2) There’s too little time as it is to read and learn all the things I’d like to read, so I have to draw certain boundaries on where that time goes.
Will you speak at my event?
Maybe! I do give the occasional talk, so feel free to share the details through the contact form below, but I try to keep them limited so as to stay focussed more on videos.
My organization would like to sponsor one of your videos.
Questions not addressed above?
(Pssst, gentle reminder that topic suggestions and questions about math are addressed above, so this is not the place to send those)
I do read all the messages I get, but I hope you understand that I can’t respond to all of them.