Raj Raizada
@rajraizada.bsky.social
Math + coding educator in NYC. Used to be university prof doing neuroscience, far happier in math ed. I enjoy making math games, in Desmos and also p5play. rajeevraizada.github.io
Reposted by Raj Raizada
Hey all! We've got a new episode of Graph Time with Sara and Sean for you today! Sara and I were playing with some graphs and discovered a really fun way to create tons of beautiful mathematical patterns. Check out the episode: www.youtube.com/watch?v=7v0J...
Discovering Beautiful Mathematical Patterns
YouTube video by Graph Time with Sara & Sean
www.youtube.com
November 14, 2025 at 7:49 PM
Hey all! We've got a new episode of Graph Time with Sara and Sean for you today! Sara and I were playing with some graphs and discovered a really fun way to create tons of beautiful mathematical patterns. Check out the episode: www.youtube.com/watch?v=7v0J...
An acronym to help my Geometry students, when trying to solve a problem: STACK, which stands for
Similar Triangles Are Consistently Key
I had suggested STATA, for "Similar Triangles Are The Answer". But then one of my students, Victor, suggested STACK. It's much better!
#iTeachMath #MathSky
Similar Triangles Are Consistently Key
I had suggested STATA, for "Similar Triangles Are The Answer". But then one of my students, Victor, suggested STACK. It's much better!
#iTeachMath #MathSky
November 10, 2025 at 10:49 AM
An acronym to help my Geometry students, when trying to solve a problem: STACK, which stands for
Similar Triangles Are Consistently Key
I had suggested STATA, for "Similar Triangles Are The Answer". But then one of my students, Victor, suggested STACK. It's much better!
#iTeachMath #MathSky
Similar Triangles Are Consistently Key
I had suggested STATA, for "Similar Triangles Are The Answer". But then one of my students, Victor, suggested STACK. It's much better!
#iTeachMath #MathSky
Reposted by Raj Raizada
November 6, 2025 at 5:03 PM
I'll try making some simple @desmos.com art with my students today. The only "math" part of this is the geometric dilation with a list of scale factors: the rest is just drawing with the Geometry polygon tool. So, mostly fun, but some learning too!
www.desmos.com/geometry/why...
#iTeachMath #MathSky
www.desmos.com/geometry/why...
#iTeachMath #MathSky
October 31, 2025 at 11:13 AM
I'll try making some simple @desmos.com art with my students today. The only "math" part of this is the geometric dilation with a list of scale factors: the rest is just drawing with the Geometry polygon tool. So, mostly fun, but some learning too!
www.desmos.com/geometry/why...
#iTeachMath #MathSky
www.desmos.com/geometry/why...
#iTeachMath #MathSky
Here's a Halloween-themed @desmos.com geometry activity, in case anyone is looking for one. Task: transform the black witch's hat onto the orange one. The first few screens use constructions, and the rest use coordinate transformations.
classroom.amplify.com/activity/690...
#iTeachMath #MathSky
classroom.amplify.com/activity/690...
#iTeachMath #MathSky
October 30, 2025 at 2:58 PM
Here's a Halloween-themed @desmos.com geometry activity, in case anyone is looking for one. Task: transform the black witch's hat onto the orange one. The first few screens use constructions, and the rest use coordinate transformations.
classroom.amplify.com/activity/690...
#iTeachMath #MathSky
classroom.amplify.com/activity/690...
#iTeachMath #MathSky
The new surface-colouring option in @desmos.com 3D allows a cute way of visualizing conic sections.
www.desmos.com/3d/fiv5gnltdl
(The option to have translucent surfaces doesn't save with the graph itself, so needs to be re-toggled on. It's important for seeing the full curves)
#MathSky #iTeachMath
www.desmos.com/3d/fiv5gnltdl
(The option to have translucent surfaces doesn't save with the graph itself, so needs to be re-toggled on. It's important for seeing the full curves)
#MathSky #iTeachMath
October 29, 2025 at 3:38 PM
The new surface-colouring option in @desmos.com 3D allows a cute way of visualizing conic sections.
www.desmos.com/3d/fiv5gnltdl
(The option to have translucent surfaces doesn't save with the graph itself, so needs to be re-toggled on. It's important for seeing the full curves)
#MathSky #iTeachMath
www.desmos.com/3d/fiv5gnltdl
(The option to have translucent surfaces doesn't save with the graph itself, so needs to be re-toggled on. It's important for seeing the full curves)
#MathSky #iTeachMath
Reposted by Raj Raizada
Have you noticed a change of colors? 🍁
You can now define colors in the 3D calculator that depend directly on coordinates. 📝 Learn more in the Desmos Help Center: help.desmos.com/hc/en-us/art... #iteachmath #mathsky
You can now define colors in the 3D calculator that depend directly on coordinates. 📝 Learn more in the Desmos Help Center: help.desmos.com/hc/en-us/art... #iteachmath #mathsky
October 28, 2025 at 6:40 PM
Have you noticed a change of colors? 🍁
You can now define colors in the 3D calculator that depend directly on coordinates. 📝 Learn more in the Desmos Help Center: help.desmos.com/hc/en-us/art... #iteachmath #mathsky
You can now define colors in the 3D calculator that depend directly on coordinates. 📝 Learn more in the Desmos Help Center: help.desmos.com/hc/en-us/art... #iteachmath #mathsky
I saw this poster in NYC, and was struck by how it (unintentionally) embodies a key tension in the philosophy of free will. We tend to be determinist when forgiving people we feel sympathy for, and libertarian when criticizing views that we dislike.
October 26, 2025 at 2:31 PM
I saw this poster in NYC, and was struck by how it (unintentionally) embodies a key tension in the philosophy of free will. We tend to be determinist when forgiving people we feel sympathy for, and libertarian when criticizing views that we dislike.
October 25, 2025 at 3:35 PM
Reposted by Raj Raizada
New yardbird! Harris’s Hawks aren’t terribly uncommon but this is a first for our east Tucson yard ☀️🪶🌵
October 23, 2025 at 3:32 PM
New yardbird! Harris’s Hawks aren’t terribly uncommon but this is a first for our east Tucson yard ☀️🪶🌵
Complex function domain-colouring of roots of unity, in @desmos.com
Here's the graph:
www.desmos.com/3d/hadt9rebbe
They recently enabled colouring a surface using functions, so far only in 3D grapher. Side-effect: allows complex domain colouring, using 3D tool as a 2D one! #iTeachMath #MathSky
Here's the graph:
www.desmos.com/3d/hadt9rebbe
They recently enabled colouring a surface using functions, so far only in 3D grapher. Side-effect: allows complex domain colouring, using 3D tool as a 2D one! #iTeachMath #MathSky
October 22, 2025 at 9:50 AM
Complex function domain-colouring of roots of unity, in @desmos.com
Here's the graph:
www.desmos.com/3d/hadt9rebbe
They recently enabled colouring a surface using functions, so far only in 3D grapher. Side-effect: allows complex domain colouring, using 3D tool as a 2D one! #iTeachMath #MathSky
Here's the graph:
www.desmos.com/3d/hadt9rebbe
They recently enabled colouring a surface using functions, so far only in 3D grapher. Side-effect: allows complex domain colouring, using 3D tool as a 2D one! #iTeachMath #MathSky
Timeline palate-cleanser: some pretty geometry in @desmos.com
www.desmos.com/geometry/wgp...
#iTeachMath #MathSky
www.desmos.com/geometry/wgp...
#iTeachMath #MathSky
October 15, 2025 at 7:29 PM
Timeline palate-cleanser: some pretty geometry in @desmos.com
www.desmos.com/geometry/wgp...
#iTeachMath #MathSky
www.desmos.com/geometry/wgp...
#iTeachMath #MathSky
Reposted by Raj Raizada
There's a nice article by Siobhan Roberts about the Bridges 2025 conference in Eindhoven in the NY Times. I can now say that I am in The NY Times! (A photo credit for the shot of Chaim Goodman-Strauss and Edmund Harriss,... but still!) www.nytimes.com/2025/10/10/s...
Every Artist Has a Favorite Subject. For Some, That’s Math.
www.nytimes.com
October 10, 2025 at 7:20 PM
There's a nice article by Siobhan Roberts about the Bridges 2025 conference in Eindhoven in the NY Times. I can now say that I am in The NY Times! (A photo credit for the shot of Chaim Goodman-Strauss and Edmund Harriss,... but still!) www.nytimes.com/2025/10/10/s...
October 9, 2025 at 4:21 PM
It looks like the Wikipedia page for Mary Brunkow got created literally just this morning, after her Nobel Prize was announced. I had heard that women in academia tend to be somewhat under-represented on Wikipedia, but this is a particularly stark example.
en.wikipedia.org/w/index.php?...
en.wikipedia.org/w/index.php?...
October 6, 2025 at 10:24 AM
It looks like the Wikipedia page for Mary Brunkow got created literally just this morning, after her Nobel Prize was announced. I had heard that women in academia tend to be somewhat under-represented on Wikipedia, but this is a particularly stark example.
en.wikipedia.org/w/index.php?...
en.wikipedia.org/w/index.php?...
Reposted by Raj Raizada
I just finished a new website on fractal self-replicating tiles ("reptiles") based on polyominoes, polyhexes, and polyiamonds: www.mathartfun.com/fractaldiver...
October 2, 2025 at 5:22 PM
I just finished a new website on fractal self-replicating tiles ("reptiles") based on polyominoes, polyhexes, and polyiamonds: www.mathartfun.com/fractaldiver...
I think my geometry students will enjoy making an infinite zoom effect, using the dilation tool in @desmos.com Geometry. Here's an initial attempt. Don't stare at it for too long! 😀
www.desmos.com/geometry/x46...
#iTeachMath
www.desmos.com/geometry/x46...
#iTeachMath
October 1, 2025 at 10:41 AM
I think my geometry students will enjoy making an infinite zoom effect, using the dilation tool in @desmos.com Geometry. Here's an initial attempt. Don't stare at it for too long! 😀
www.desmos.com/geometry/x46...
#iTeachMath
www.desmos.com/geometry/x46...
#iTeachMath
September 28, 2025 at 1:46 PM
Is this a new piece of Kenny Scharf graffiti on W 57th St? I walked past it this morning and don’t recall seeing it before.
September 22, 2025 at 12:21 PM
Is this a new piece of Kenny Scharf graffiti on W 57th St? I walked past it this morning and don’t recall seeing it before.
Here is a @desmos.com activity about the symmetry-preserving transformations of a square, inspired by my colleague Tom Jameson.
classroom.amplify.com/activity/68c...
For a really great intro to how this relates to group theory, see this by @stevenstrogatz.com archive.nytimes.com/opinionator....
classroom.amplify.com/activity/68c...
For a really great intro to how this relates to group theory, see this by @stevenstrogatz.com archive.nytimes.com/opinionator....
September 21, 2025 at 10:02 PM
Here is a @desmos.com activity about the symmetry-preserving transformations of a square, inspired by my colleague Tom Jameson.
classroom.amplify.com/activity/68c...
For a really great intro to how this relates to group theory, see this by @stevenstrogatz.com archive.nytimes.com/opinionator....
classroom.amplify.com/activity/68c...
For a really great intro to how this relates to group theory, see this by @stevenstrogatz.com archive.nytimes.com/opinionator....
Making pretty patterns is fun. And it can help you to learn geometry! I made a short video about how to make a snowflake in @desmos.com Geometry. Comments and suggestions welcome! #iTeachMath ❄️
www.youtube.com/shorts/EI1RN...
www.youtube.com/shorts/EI1RN...
How to make a snowflake in Desmos Geometry
YouTube video by Aha, That Makes Sense
www.youtube.com
September 15, 2025 at 10:39 AM
Making pretty patterns is fun. And it can help you to learn geometry! I made a short video about how to make a snowflake in @desmos.com Geometry. Comments and suggestions welcome! #iTeachMath ❄️
www.youtube.com/shorts/EI1RN...
www.youtube.com/shorts/EI1RN...
Seen at the MoMA Design Store. @momanyc.bsky.social .
It’s a nicely designed light, but it’s not a hexagon! #
It’s a nicely designed light, but it’s not a hexagon! #
August 30, 2025 at 7:15 PM
Seen at the MoMA Design Store. @momanyc.bsky.social .
It’s a nicely designed light, but it’s not a hexagon! #
It’s a nicely designed light, but it’s not a hexagon! #
Great to see the NYT launch another math-related puzzle, after their Numbers game got beta-tested and then dropped a couple of years ago
Psst ... From the "New Toy" Department at NYT Games: a logic puzzle! Go git it!
www.nytimes.com/games/pips?f...
www.nytimes.com/games/pips?f...
Play Pips, our new dominoes game for all skill levels.
Every domino has a spot. Can you find where each belongs?
www.nytimes.com
August 26, 2025 at 11:19 AM
Great to see the NYT launch another math-related puzzle, after their Numbers game got beta-tested and then dropped a couple of years ago
Reposted by Raj Raizada
In a new op-ed, Cornell Tech professor Tanzeem Choudhury and postdoctoral associate Dan Adler argue for a new labelling system for AI-driven mental health tools.
Read more in STAT: www.statnews.com/2025/08/20/c...
Read more in STAT: www.statnews.com/2025/08/20/c...
AI should come with green, yellow, and red lights for mental health
There is an immediate need for a new, agile process that helps everyday people find safe and trustworthy mental health AI support without stifling innovation.
www.statnews.com
August 21, 2025 at 5:43 PM
In a new op-ed, Cornell Tech professor Tanzeem Choudhury and postdoctoral associate Dan Adler argue for a new labelling system for AI-driven mental health tools.
Read more in STAT: www.statnews.com/2025/08/20/c...
Read more in STAT: www.statnews.com/2025/08/20/c...
This talk by Erik Demaine was great. And I very much enjoyed the talk by Dave Richeson on the game Left, Center, Right too!
Yesterday at the MoMath MOVES conference, Erik Demaine discussed QR codes and showed examples of how to incorporate images into them so they are still scannable. I had to give it a try. This QR code should take you to my website.
August 13, 2025 at 2:26 PM
This talk by Erik Demaine was great. And I very much enjoyed the talk by Dave Richeson on the game Left, Center, Right too!