χle Ormsby
@motivickyle.bsky.social
Numbers and shapes at Reed College. Mathematician, parent, spouse, runner, 𝔣𝔯𝔞𝔨𝔱𝔲𝔯 enthusiast. He or they.
Regarding the rank-nullity theorem. 🧮
The math gods were extremely generous when they allowed finite dimensional vector spaces to admit a decategorification that was additive with respect to exact sequences.
February 8, 2026 at 10:36 PM
Regarding the rank-nullity theorem. 🧮
It’s hard to keep up with my favorite AI author’s book-a-day output, but no worry — I’ll just have AI summarize the novels for me, thus eliminating humans from both the writing and reading processes.
I'm going to win.
February 8, 2026 at 4:42 PM
It’s hard to keep up with my favorite AI author’s book-a-day output, but no worry — I’ll just have AI summarize the novels for me, thus eliminating humans from both the writing and reading processes.
Reposted by χle Ormsby
The Crespo-Gonzalez family is home.
Our community refused to stay silent in the face of such an immoral, unethical detention. Now, we must continue speaking up for the countless other families and children imprisoned by Trump.
Stay loud.
Our community refused to stay silent in the face of such an immoral, unethical detention. Now, we must continue speaking up for the countless other families and children imprisoned by Trump.
Stay loud.
February 7, 2026 at 7:54 PM
The Crespo-Gonzalez family is home.
Our community refused to stay silent in the face of such an immoral, unethical detention. Now, we must continue speaking up for the countless other families and children imprisoned by Trump.
Stay loud.
Our community refused to stay silent in the face of such an immoral, unethical detention. Now, we must continue speaking up for the countless other families and children imprisoned by Trump.
Stay loud.
Are girl dinner and ploughman’s lunch the same thing?
February 8, 2026 at 4:20 AM
Are girl dinner and ploughman’s lunch the same thing?
Truly, though: ADD CROSS COUNTRY RUNNING TO THE WINTER OLYMPICS.
i don't see why they can't do all the track and field events at both olympics. put a coat on
February 8, 2026 at 12:24 AM
Truly, though: ADD CROSS COUNTRY RUNNING TO THE WINTER OLYMPICS.
Thank goodness it’s cold and wet again — I was starting to miss my Raynaud’s.
February 7, 2026 at 11:36 PM
Thank goodness it’s cold and wet again — I was starting to miss my Raynaud’s.
This is where I post from btw
February 7, 2026 at 5:56 PM
This is where I post from btw
Whomst among us has not found $21M in the couch cushions in November and then another $85M in February?
The Portland Housing Bureau (PHB) is sitting on $106 million in unspent funds, far more than was previously reported. City Administrator Raymond Lee outlined the funding in a memo Friday afternoon.
Update: Portland Housing Bureau's Unspent Funds Reach $106 Million
News of the unspent money comes two months after city councilors learned the city's Rental Services Office amassed $21 million in revenue, which went unreported for months.
www.portlandmercury.com
February 7, 2026 at 12:56 AM
Whomst among us has not found $21M in the couch cushions in November and then another $85M in February?
My most right-wing coded take is that I believe sans serif fonts are an abomination.
February 6, 2026 at 9:31 PM
My most right-wing coded take is that I believe sans serif fonts are an abomination.
February 6, 2026 at 4:10 PM
Woke up anxious today. Better have more coffee and see if that helps.
February 6, 2026 at 3:12 PM
Woke up anxious today. Better have more coffee and see if that helps.
lmao at the lib accounts salivating over Revelations from the Clintons — Clintons! — in their Epstein testimony. As if they've had dirt for this long but would only reveal it due to congressional subpoena? This is like predicting that Bill commits seppuku on live television.
February 6, 2026 at 2:50 PM
lmao at the lib accounts salivating over Revelations from the Clintons — Clintons! — in their Epstein testimony. As if they've had dirt for this long but would only reveal it due to congressional subpoena? This is like predicting that Bill commits seppuku on live television.
Hang in there, postdoc candidates! I join the AMS in hoping that "all departments will offer as much flexibility as possible to candidates who receive delayed news affecting their decisions". 🧮 www.ams.org/news?news_id...
The National Science Foundation has indicated that, as of February 4, 2026, they are not yet prepared to announce their fellowship recipients. While the NSF stated that results might be released in the coming weeks, this delay places both job-seekers and hiring institutions in a difficult position.
February 5, 2026 at 8:58 PM
Hang in there, postdoc candidates! I join the AMS in hoping that "all departments will offer as much flexibility as possible to candidates who receive delayed news affecting their decisions". 🧮 www.ams.org/news?news_id...
Allow me to gently recommend that you visit your library’s oversized book section.
February 5, 2026 at 7:26 PM
Allow me to gently recommend that you visit your library’s oversized book section.
Reposted by χle Ormsby
This captures well why I've grown so allergic to what I'll call "pedagogies of certainty" that still dominate many corners of STEM and STEM education, and indeed even attract many into our fields
Yesterday, I heard someone say that the real battle is between empathy and certainty. Fascism and fundamentalism provide a false certainty that is reassuring to many people but is a dead end; art provides an expansive empathy that brings challenge but also growth.
February 5, 2026 at 4:33 PM
This captures well why I've grown so allergic to what I'll call "pedagogies of certainty" that still dominate many corners of STEM and STEM education, and indeed even attract many into our fields
You have been visited by George Birkhoff's face of lines. Repent, or you will be forced to reprove the ergodic theorem from first principles.
February 5, 2026 at 2:40 PM
You have been visited by George Birkhoff's face of lines. Repent, or you will be forced to reprove the ergodic theorem from first principles.
Reposted by χle Ormsby
No child, but especially not a sick second grader on the way to urgent care, should be detained by ICE and then trapped in a facility with measles. I cannot stand by while my constituents' rights are stripped.
I’m headed to Dilley to conduct oversight and do everything I can to bring them home.
I’m headed to Dilley to conduct oversight and do everything I can to bring them home.
February 4, 2026 at 7:22 PM
No child, but especially not a sick second grader on the way to urgent care, should be detained by ICE and then trapped in a facility with measles. I cannot stand by while my constituents' rights are stripped.
I’m headed to Dilley to conduct oversight and do everything I can to bring them home.
I’m headed to Dilley to conduct oversight and do everything I can to bring them home.
It's a good thing Buddhism got to Tibet before unicode; otherwise we'd have mantras like 🙌💎∈🪷.
February 4, 2026 at 3:17 PM
It's a good thing Buddhism got to Tibet before unicode; otherwise we'd have mantras like 🙌💎∈🪷.
If anyone wants to take the already-fabulous q.uiver.app and create a version that produces PreFigure output (prefigure.org/docs/sec-net...), I would be eternally grateful.
quiver
A modern commutative diagram editor with support for tikz-cd.
q.uiver.app
February 4, 2026 at 2:39 PM
If anyone wants to take the already-fabulous q.uiver.app and create a version that produces PreFigure output (prefigure.org/docs/sec-net...), I would be eternally grateful.
Reposted by χle Ormsby
put it in the Louvre
February 4, 2026 at 9:23 AM
put it in the Louvre
Round Fred, kiddo's latest creation.
February 4, 2026 at 3:44 AM
Round Fred, kiddo's latest creation.
Anyone have favorite references for how to handle "size issues" in category theory? I mumbled something about Grothendieck universes to my students, but don't want to belabor it in class. Maybe there's a reasonably accessible and accurate reference out there?
February 3, 2026 at 10:02 PM
Anyone have favorite references for how to handle "size issues" in category theory? I mumbled something about Grothendieck universes to my students, but don't want to belabor it in class. Maybe there's a reasonably accessible and accurate reference out there?
Or — hear me out — "men's retreat".
Can't believe they're going with 'male flight' when guy-bye, bro-go, and male bail are all right there.
February 3, 2026 at 7:39 PM
Or — hear me out — "men's retreat".
Motion to rename the Grothendieck-Witt group GW the quadratic K-group KQ. 🧮
Yeah I gotta bring this up every time I talk/write about the algebraic theory of quadratic forms 😿 kyleormsby.github.io/files/quadra...
February 3, 2026 at 7:07 PM
Motion to rename the Grothendieck-Witt group GW the quadratic K-group KQ. 🧮
Reposted by χle Ormsby
In a rare pause, Keith Devlin reflects on why he could not write as usual and what this moment means for our shared values as a mathematical community.
Read the Math Values post: https://bit.ly/49YfHSA
Read the Math Values post: https://bit.ly/49YfHSA
This month’s post is that there is no post this month – Mathematical Association of America
maa.org
February 3, 2026 at 5:52 PM
In a rare pause, Keith Devlin reflects on why he could not write as usual and what this moment means for our shared values as a mathematical community.
Read the Math Values post: https://bit.ly/49YfHSA
Read the Math Values post: https://bit.ly/49YfHSA