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Owen Biesel

@owenbiesel.bsky.social

Math prof, dad, gardener, knitter, bike rider, community member, friendly introvert. he/him πŸ³οΈβ€πŸŒˆ Also on mastodon as @owenbiesel@mathstodon.xyz

659 Followers  |  574 Following  |  499 Posts  |  Joined: 24.04.2024  |  2.1265

Latest posts by owenbiesel.bsky.social on Bluesky

My painting is a take on the famous 'A Sunday on La Grande Jatte' painting by Georges Seurat. In the original painting, people are enjoying a nice day in the park. My reimagined painting includes a fiery sky, polluted water, and suffering people. These are all effects of climate change that have begun to occur. My painting also shows a wealthy person, who has the luxury of ignoring the problems. I believe this will all worsen if something isn't done to reverse this tragedy.

My painting is a take on the famous 'A Sunday on La Grande Jatte' painting by Georges Seurat. In the original painting, people are enjoying a nice day in the park. My reimagined painting includes a fiery sky, polluted water, and suffering people. These are all effects of climate change that have begun to occur. My painting also shows a wealthy person, who has the luxury of ignoring the problems. I believe this will all worsen if something isn't done to reverse this tragedy.

Art x Climate is an integral part of the Fifth National Climate Assessment (NCA5), restored by Climate.us. One of the featured artworks is β€œSunday in the Park with Climate Change” by Mikaela R. Year and Medium: 2023, watercolor. Link to the full Art X Climate gallery in comments.

13.02.2026 17:58 β€” πŸ‘ 15    πŸ” 5    πŸ’¬ 1    πŸ“Œ 1

I love this!

13.02.2026 21:28 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

I introduced "chuffed" to one of my classes last semester! In case you need permission: granted.

13.02.2026 12:04 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
Preview
Anthropic AI safety researcher quits with 'world in peril' warning It comes in the same week an OpenAI researcher resigned amid concerns about its decision to start testing ChatGPT ads.

Anthropic head of AI safety quits, warning of "world in peril" & announces plan to study creative writing, as my college charges ahead in deal with Anthropic, which trained its tech on at least 25 books taken without permission from our Creative Writing faculty. www.bbc.com/news/article...

13.02.2026 00:46 β€” πŸ‘ 940    πŸ” 395    πŸ’¬ 20    πŸ“Œ 40

Does your university use ChatGPT Edu? Please send me a DM if you do. I have identified a potential data breach affecting students' data that has not yet been fixed and I'm trying to compile further examples from other universities.

Reposts appreciated!

12.02.2026 21:08 β€” πŸ‘ 24    πŸ” 32    πŸ’¬ 1    πŸ“Œ 1
EFFECT: Requires any greenhouse gas emissions and vehicle miles
traveled reduction requirements adopted by a regional transportation
planning organization to not impose additional obligations or costs
on any bridge replacement project, including for the I-5 bridge over
the Columbia River.

EFFECT: Requires any greenhouse gas emissions and vehicle miles traveled reduction requirements adopted by a regional transportation planning organization to not impose additional obligations or costs on any bridge replacement project, including for the I-5 bridge over the Columbia River.

HB 2134 is gathering crappy Republican amendments! That's a good sign. It suggests the bill is moving towards a vote and is likely to pass. (Assume the word "crappy" modifies whichever noun you prefer.)

13.02.2026 03:07 β€” πŸ‘ 7    πŸ” 3    πŸ’¬ 0    πŸ“Œ 0

So the only way to have an ambiguous 4-term sequence like this is:

* Omit the second term of a geometric sequence with r = -1/2
* Omit the third term of a geometric sequence with r = -2
* Omit any term of a constant sequence (sorry)

11.02.2026 22:55 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

We know r=1 is a solution, so dividing through by (r-1) should yield the other two:

2r^2 = r + 1

which has solutions r = 1 (again!?) and r = -1/2 (there we go!)

11.02.2026 22:55 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

Assuming without loss of generality that it's the second position (reversing the sequence if necessary) and the first term is 1 (by rescaling), we have

1, ??, r^2, r^3

and to also fit an arithmetic sequence that means

2(r^3 - r^2) = (r^2 - 1)

11.02.2026 22:55 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

This also means the terms of the geometric sequence must alternate in sign, so the two sequences can't overlap for three consecutive terms and the blank spot *must* be in the 2nd or 3rd position.

11.02.2026 22:55 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

First observation: a line y=mx+b and an exponential y = ar^x with r>0 can't cross more than twice (unless a=0 or r=1), so the base of the exponential must be *negative*, as in your two examples.

11.02.2026 22:55 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
Picket line on the sidewalk next to cars with full rainbow overhead.

Picket line on the sidewalk next to cars with full rainbow overhead.

Choosing to step away from the classroom for a labor action has been so difficult, and it has been so energizing to have educators and community members joining together as we fight for the future of San Francisco public schools. #WeCan'tWait

11.02.2026 22:09 β€” πŸ‘ 8    πŸ” 4    πŸ’¬ 0    πŸ“Œ 2

Using AI on Notepad is like … I don’t know, carpeting the room your water heater is in. You do not need to do it, and all you do is create more opportunities for something bad to happen.

11.02.2026 21:32 β€” πŸ‘ 253    πŸ” 32    πŸ’¬ 3    πŸ“Œ 0

Here's why pursuing impeachment is a good idea, even if it doesn't succeed: a short 🧡 aimed at @delauro.house.gov

11.02.2026 22:05 β€” πŸ‘ 0    πŸ” 1    πŸ’¬ 1    πŸ“Œ 0

One final thought: If you, @delauro.house.gov , are choosing not to support impeachment because not enough of your colleagues currently support impeachment, then you are literally part of the problem. It shouldn't be this hard to get you to do the right thing.

11.02.2026 22:05 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

4. Impeachment could work! There are already cracks showing in the conservative coalition, and several prominent republicans have publicly started to distance themselves from Trump. Let's give them as many chances as they need to get on board! (God knows there's no shortage of impeachable offenses.)

11.02.2026 22:05 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

3. Forcing impeachment proceedings using Rule IX ties up at least the house, slowing down the Republican-controlled congress. Don't we want them to get less done during their reign of terror?

11.02.2026 22:05 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

2. Impeachment puts our representatives and senators on the record. Why should we spare Republicans the dilemma of whether to side with Trump over their oaths of office? Let's give their constituents concrete reasons to oust them!

11.02.2026 22:05 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

1. Impeachment puts the national spotlight on the criminal/illegal nature of the Trump regime's actions. We need a lot more "Here's how what they're doing is illegal" media coverage.

11.02.2026 22:05 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

Here's why pursuing impeachment is a good idea, even if it doesn't succeed: a short 🧡 aimed at @delauro.house.gov

11.02.2026 22:05 β€” πŸ‘ 0    πŸ” 1    πŸ’¬ 1    πŸ“Œ 0

Does that mean you're ready to cosponsor articles of impeachment? (Anyone can complain about Pam Bondi; I'm waiting for you to do something about it.)

11.02.2026 21:30 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 2    πŸ“Œ 0

No specific skill is necessary to be a mathematician.

I am also easily bored by long calculations and totally uninterested in programming. And guess what? It doesn't matter.

All one needs is passion, some effort, and a support group for comfort in case of blocks or mistakes.

/End

11.02.2026 17:34 β€” πŸ‘ 7    πŸ” 2    πŸ’¬ 0    πŸ“Œ 0

A truly wonderful video on the lack of science or sense in Forester’s β€œEffective Cycling”.
How were so many people convinced by his baseless assertions?

11.02.2026 03:16 β€” πŸ‘ 56    πŸ” 9    πŸ’¬ 4    πŸ“Œ 1

You're welcome, but I feel like you're the one doing me a favor by writing it!

11.02.2026 17:19 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

Just preordered it from my local indie bookstore's website!

11.02.2026 17:10 β€” πŸ‘ 1    πŸ” 1    πŸ’¬ 1    πŸ“Œ 0

i am certain some of y'all who follow me are in the middle of this venn diagram

10.02.2026 16:08 β€” πŸ‘ 12    πŸ” 3    πŸ’¬ 0    πŸ“Œ 0

Hey, and stats/data visualization folks wanna help me with a project? I gotta figure out how best to estimate missing bike counter data from last year. Problem is, I got a C in high school stats. Email tom@seattlebikeblog.com

10.02.2026 00:31 β€” πŸ‘ 20    πŸ” 3    πŸ’¬ 4    πŸ“Œ 0

Friends - have any of you moved from Substack to Ghost? I'd love to talk about it/hear about your experience. Thanks!

09.02.2026 16:43 β€” πŸ‘ 5    πŸ” 2    πŸ’¬ 3    πŸ“Œ 0

Wow this is really awesome.

08.02.2026 23:38 β€” πŸ‘ 71    πŸ” 13    πŸ’¬ 2    πŸ“Œ 0

it’s funny how everyone is talking about Newsom when Ossoff is, by far, the strongest 2028 candidate. he’s about to cruise to re-election in Georgia and when he does I think folks will start to wake up and realize he’s been the one all along

08.02.2026 18:39 β€” πŸ‘ 204    πŸ” 15    πŸ’¬ 16    πŸ“Œ 2

@owenbiesel is following 20 prominent accounts