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
Sunrise over Queens
November 25, 2025 at 11:42 AM
Sunrise over Queens
Reposted by Raj Raizada
I haven't been very active here for several months, because I've been working on a new book. Soon I will be able to tell you about it. Is anyone out there interested?
November 17, 2025 at 8:57 AM
I haven't been very active here for several months, because I've been working on a new book. Soon I will be able to tell you about it. Is anyone out there interested?
Reposted by Raj Raizada
10th-Grade Prodigy Studying Mathematics At 10th-Grade Level https://theonion.com/10th-grade-prodigy-studying-mathematics-at-10th-grade-l-1819577209/
November 13, 2025 at 5:00 PM
10th-Grade Prodigy Studying Mathematics At 10th-Grade Level https://theonion.com/10th-grade-prodigy-studying-mathematics-at-10th-grade-l-1819577209/
@jeremydenk.bsky.social I just started listening to your book Every Good Boy Does Fine, and was immediately captivated by your description of listening to K364 as a boy. I was just like that (apart from the whole going on to be a virtuoso thing 😀). For me, the middle mvt of 364 did it. More so: K488
November 17, 2025 at 11:27 AM
@jeremydenk.bsky.social I just started listening to your book Every Good Boy Does Fine, and was immediately captivated by your description of listening to K364 as a boy. I was just like that (apart from the whole going on to be a virtuoso thing 😀). For me, the middle mvt of 364 did it. More so: K488
Reposted by Raj Raizada
Lava erupts from Hawaii's Kilauea volcano.
One of the most active volacanoes in the world has started erupting. Kilauea, on Hawaii's Big Island, is spewing large columns of lava into the air. Kilauea is one of six active volcanoes located in the Hawaiian Islands
One of the most active volacanoes in the world has started erupting. Kilauea, on Hawaii's Big Island, is spewing large columns of lava into the air. Kilauea is one of six active volcanoes located in the Hawaiian Islands
November 10, 2025 at 5:02 AM
Lava erupts from Hawaii's Kilauea volcano.
One of the most active volacanoes in the world has started erupting. Kilauea, on Hawaii's Big Island, is spewing large columns of lava into the air. Kilauea is one of six active volcanoes located in the Hawaiian Islands
One of the most active volacanoes in the world has started erupting. Kilauea, on Hawaii's Big Island, is spewing large columns of lava into the air. Kilauea is one of six active volcanoes located in the Hawaiian Islands
Reposted by Raj Raizada
Sunday night seems the right time to post a gallery of (I hope!) every one of Catriona's geometry puzzles.
notes.mathforge.org/notes/publis...
Give it a moment to load ... there's a *lot* of them!
#GeometryPuzzles #UKMathsChat #mathsky
notes.mathforge.org/notes/publis...
Give it a moment to load ... there's a *lot* of them!
#GeometryPuzzles #UKMathsChat #mathsky
Puzzle Gallery in Notes
notes.mathforge.org
November 16, 2025 at 6:24 PM
Sunday night seems the right time to post a gallery of (I hope!) every one of Catriona's geometry puzzles.
notes.mathforge.org/notes/publis...
Give it a moment to load ... there's a *lot* of them!
#GeometryPuzzles #UKMathsChat #mathsky
notes.mathforge.org/notes/publis...
Give it a moment to load ... there's a *lot* of them!
#GeometryPuzzles #UKMathsChat #mathsky
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.