Arun
@aroon.bsky.social
I have read Guards! Guards! seven times. I also like math, systems programming, and astronomy. Every month or so I say “Man, I should bike more.”
https://arunvijayshankar.github.io/
https://arunvijayshankar.github.io/
No new pictures, where are you mentally?
August 26, 2025 at 5:12 AM
No new pictures, where are you mentally?
Reposted by Arun
N: Kirkjufell, Iceland
S: Singapore
E: Singapore
W: Cape Flattery, USA
S: Singapore
E: Singapore
W: Cape Flattery, USA
N: Berlin, Germany
E: Tokyo, Japan
S: Yogyakarta, Indonesia
W: Honolulu, Hawaii
E: Tokyo, Japan
S: Yogyakarta, Indonesia
W: Honolulu, Hawaii
Furthest I've been:
N: Stockholm, Sweden
E: Malé, Maldives
S: Santos, Brazil
W: San Francisco -> San Francisco (around the world)
N: Stockholm, Sweden
E: Malé, Maldives
S: Santos, Brazil
W: San Francisco -> San Francisco (around the world)
August 8, 2025 at 2:36 AM
N: Kirkjufell, Iceland
S: Singapore
E: Singapore
W: Cape Flattery, USA
S: Singapore
E: Singapore
W: Cape Flattery, USA
Reposted by Arun
Dear #mathsky, if you repost this, it will let people see the article for free. Thanks!
www.nytimes.com/interactive/...
www.nytimes.com/interactive/...
How Bees, Beer Cans and Data Solve the Same Packing Problem (Gift Article)
Trying to fit it all in? There’s a trick to it, even in 24 dimensions.
www.nytimes.com
June 23, 2025 at 10:53 AM
Dear #mathsky, if you repost this, it will let people see the article for free. Thanks!
www.nytimes.com/interactive/...
www.nytimes.com/interactive/...
Reposted by Arun
Reposted by Arun
My latest for @nytimes.com -- please repost so your followers can see this for free. www.nytimes.com/interactive/...
How a Puzzle About Fractions Got Brain Scans Rolling (Gift Article)
A story of bowling pins, patterns and medical miracles.
www.nytimes.com
June 30, 2025 at 10:33 AM
My latest for @nytimes.com -- please repost so your followers can see this for free. www.nytimes.com/interactive/...
Yes! Firefox has implemented Tag grouping!
May 2, 2025 at 5:44 PM
Yes! Firefox has implemented Tag grouping!
Reposted by Arun
Finally got around to processing the eclipse images -
March 19, 2025 at 7:05 AM
Finally got around to processing the eclipse images -
Finally got around to processing the eclipse images -
March 19, 2025 at 7:05 AM
Finally got around to processing the eclipse images -
It finally happened. I heard something about “thirty years ago” on a video, and I thought, “oh ya, the 70’s” 🫠
March 3, 2025 at 5:36 PM
It finally happened. I heard something about “thirty years ago” on a video, and I thought, “oh ya, the 70’s” 🫠
But is it better than the movie?
February 26, 2025 at 6:04 AM
But is it better than the movie?
Quote post with a picture you took in a National Park.
Bryce Canyon National Park
Bryce Canyon National Park
February 25, 2025 at 5:18 PM
Quote post with a picture you took in a National Park.
Bryce Canyon National Park
Bryce Canyon National Park
Here’s a neat little problem (mentioned here - www.erdosproblems.com/go_to/828) - with phi(n) being the Euler phi function, prove that phi(n) | n iff n = 2^a x 3^b (a >= 1)
Erdős Problems
www.erdosproblems.com
February 25, 2025 at 5:59 AM
Here’s a neat little problem (mentioned here - www.erdosproblems.com/go_to/828) - with phi(n) being the Euler phi function, prove that phi(n) | n iff n = 2^a x 3^b (a >= 1)
What if we started spelling jokes with an L - jolks.
February 19, 2025 at 7:23 AM
What if we started spelling jokes with an L - jolks.
Reposted by Arun
Interesting non-technical discussion on MathOverflow on how (non-technical!) journalists get their math stories or start talking about this or that breakthrough in math: mathoverflow.net/q/487989/17064
How do mathematical developments make their way into the mass media?
This question may seem off topic, and feel free to express that, but first let me say why I think it belongs here.
Every so often there are articles in mainstream newspapers, and also in popular sc...
mathoverflow.net
February 19, 2025 at 6:46 AM
Interesting non-technical discussion on MathOverflow on how (non-technical!) journalists get their math stories or start talking about this or that breakthrough in math: mathoverflow.net/q/487989/17064
I wrote a post about a nice little problem on infinite series
arunvijayshankar.github.io/archive/an-i...
arunvijayshankar.github.io/archive/an-i...
An interesting infinite series
An area of mathematics with which I had a lot of trouble was infinite sequences and series. To address this I have been practicing by solving a bunch of problems on this topic. Here’s an interesting, ...
arunvijayshankar.github.io
January 15, 2025 at 6:11 AM
I wrote a post about a nice little problem on infinite series
arunvijayshankar.github.io/archive/an-i...
arunvijayshankar.github.io/archive/an-i...
We’re putting together an emergency to go bag, and had to choose one book each to take with us.
January 12, 2025 at 4:02 AM
We’re putting together an emergency to go bag, and had to choose one book each to take with us.
Reposted by Arun
The media is so fixated on Pacific Palisades/Malibu because of the wealth, but they're not really talking about the parts of Pasadena, Hollywood, and Altadena that have mostly working class people. Altadena is a lovely diverse neighborhood and so much of it is gone.
www.reuters.com/world/us/far...
www.reuters.com/world/us/far...
Far from Hollywood's wealth, Los Angeles fire survivors feel forgotten
Residents say that insurance companies might shortchange less affluent households.
www.reuters.com
January 10, 2025 at 9:34 AM
The media is so fixated on Pacific Palisades/Malibu because of the wealth, but they're not really talking about the parts of Pasadena, Hollywood, and Altadena that have mostly working class people. Altadena is a lovely diverse neighborhood and so much of it is gone.
www.reuters.com/world/us/far...
www.reuters.com/world/us/far...
Reposted by Arun
31 December 1995. Still the perfect goodbye.
December 31, 2024 at 12:21 PM
31 December 1995. Still the perfect goodbye.
Hiked the gorgeous Winter Trail loop for Christmas
December 26, 2024 at 2:03 AM
Hiked the gorgeous Winter Trail loop for Christmas
Reposted by Arun
Three steps to equivalence proofs:
1. If (forward implication)
2. Only if (reverse implication)
3. If only (realize it's false)
1. If (forward implication)
2. Only if (reverse implication)
3. If only (realize it's false)
December 7, 2024 at 7:31 PM
Three steps to equivalence proofs:
1. If (forward implication)
2. Only if (reverse implication)
3. If only (realize it's false)
1. If (forward implication)
2. Only if (reverse implication)
3. If only (realize it's false)