Raj Raizada

Thanks!

v8 Radians space invaders, with pause button by Raj Raizada

This is not for trig identities, but it is sort of relevant: a space-invaders game in @desmos.com, helping students to learn radian angles. People have told me that it's reasonably entertaining!
classroom.amplify.com/activity/637...

The Berggruen Klee Collection, 1984

Three Houses https://www.metmuseum.org/art/collection/search/483148

What an astonishing thing to discover

Sad to see that trinket.io will be shutting down in August 😥. It's great for running Python Turtle online. Their website recommends switching to Pickcode, but their free version doesn't support turtle. CodeHS looks more promising (@codehs.bsky.social).
Here's an example: codehs.com/sandbox/raje...

The 2025 Desmos Art Contest gallery is now live 📣! Filter by feature and find your new favorite graph at desmos.com/art 🎨
#mathsky #iteachmath #mathart

Tracking does indeed happen a lot, but there's certainly a segment of opinion that thinks it's really bad thing to do.

I've always wondered why tracking is so controversial in high school, but it seems much less controversial that the graduating kids who are really good at math and engineering go to MIT etc., where they get taught more advanced material. Why is this ok for college, but not in the preceding years?

Went tidepooling today. Saw the best octopus.

Aw, shucks ☺️

Sunrise over chunks of ice floating in the East River

Nice! Does this use the p5play physics engine @q5play.bsky.social, or something else?

Here's an animation of Steiner's porism, made in @desmos.com Geometry.
en.wikipedia.org/wiki/Steiner...
In case they are useful to anyone, this graph contains reusable Desmos functions for doing circle-inversion of points, lines and circles.
www.desmos.com/geometry/xkq...
#iTeachMath #MathSky

Interesting! This is far too complex a question to respond to within a BlueSky post, and I've probably peppered you with too many questions already, so totally fine not to respond: Do you subscribe to moral realism because of Parfit's arguments, or do you find some other approach more convincing?

I respect that. You certainly present the arguments in a very compelling way! It would be almost impossible to know how much, alas, but a fair amount of charitable giving might well end up getting spurred by your book.

On a related note, do you agree with Parfit that morality is objective?

I’m curious, if I may ask (no need to answer!): did writing the book make you feel more aligned with the EA approach? I’m sympathetic to its ideas (except for far-future speculations) but I don’t think I give nearly as much as they would recommend. Maybe after I’ve paid my kids’ future college fees!

Thank you to you for writing the books! (And for the Philosophy Bites podcast!). Social media may have many negatives, but they do make it a lot easier to contact and thank the authors of books I’ve enjoyed!

I just finished this book. A great read. Thanks for writing it! I also very much enjoyed your book on Derek Parfit. It’s rare to find complex topics presented in such an engaging and readable way. Thanks!

#genuary 2: 12 principles of animation. Here's some anticipation and overshoot done in a p5.strands shader. #p5 #p5v2 openprocessing.org/sketch/2838235

Born #OnThisDay in 1887 was Indian mathematician Srinivasa Ramanujan. Despite having almost no training in mathematics, he is regarded as one of the greatest mathematicians of all time. He became one of the youngest Fellows in the Royal Society's history when he was elected in 1918 at the age of 31.

Possibly a fun activity for before Winter Break: a snowflake maker in @desmos.com
(By the way, this is an old graph. It would be much easier to make in the new Geometry tool, but it might be interesting to see the trig in the Graphing Calculator).
#iTeachMath #MathSky
www.desmos.com/calculator/c...

Ooh, the new split-view option for Chrome tabs is quite handy!
lifehacker.com/tech/google-...
Right now I'm typings Qs for a scaffolded math quiz into a Google Doc, with a split-view Desmos graph by its side in the same tab.
Much easier than juggling separate windows with their borders and overlaps

My kid is reading it right now, as am I. It’s fun to be able to chat with him about the story as it unfolds. We are both enjoying the book a lot. Thanks for writing it! By the way, my older son is a big fan of “I Must Betray You”, so thanks for that too!

Thanks! That's a very useful distinction to draw, and it makes things a lot clearer for me. Much appreciated!

Specifically, isn’t the normal behavior to produce the error message “You have defined this more than once”, and then show warning ⚠️ signs? In this case, it simply seems to overwrite the first definition by the second

Aha, thanks! Yes, that does help. It’s not obvious, though, that this is what’s happening. I wonder if the display could float a warning saying that?

Good point!
That succeeds as a workaround, but I feel that
f(x) = g(x)
and
f(x) - g(x) = 0
should produce the same results in the graph.
Especially for students, the different results could be confusing, if any of them happen to stumble into this.
A similar problem arises in the Desmos 3D grapher.

@desmos.com This looks like it's a bug? I'll e.mail it to support@desmos.com too.
www.desmos.com/calculator/m...

I’d be very interested to hear what you think of it. Louis Armstrong does things with rhythm that I’ve never heard from anyone else.

Twelfth Street Rag YouTube video by Louis Armstrong - Topic

Here's a link to the audio (via YouTube):
www.youtube.com/watch?v=B0xr...
I actually recommend listening to a "normal" recording of the same piece first, to get a baseline sense of what the vanilla version of the rhythm is. E.g. www.youtube.com/watch?v=_IdN...