January 24, 2026 at 11:24 PM
Winter garden for the little creatures! #Cimicifuga #BNWmacro #ClassicMono #BirdTracks #Monochrome #EastCoastKin #Photography #VT
February 15, 2026 at 10:42 PM
Winter garden for the little creatures! #Cimicifuga #BNWmacro #ClassicMono #BirdTracks #Monochrome #EastCoastKin #Photography #VT
Some bird tracks in the snow
#birdtracks #birdprints #birds #wildlifeinaurora #turtleisland #spottedinthearb #auroraontario #auroraarboretum #auroraca
#snow #goon
#birdtracks #birdprints #birds #wildlifeinaurora #turtleisland #spottedinthearb #auroraontario #auroraarboretum #auroraca
#snow #goon
December 31, 2025 at 12:06 PM
Some bird tracks in the snow
#birdtracks #birdprints #birds #wildlifeinaurora #turtleisland #spottedinthearb #auroraontario #auroraarboretum #auroraca
#snow #goon
#birdtracks #birdprints #birds #wildlifeinaurora #turtleisland #spottedinthearb #auroraontario #auroraarboretum #auroraca
#snow #goon
Might be the result of publishing a paper with the term "Birdtracks" in the title.
@skzwitschert.bsky.social @simonplaetzer.bsky.social
@skzwitschert.bsky.social @simonplaetzer.bsky.social
February 26, 2025 at 10:16 AM
Might be the result of publishing a paper with the term "Birdtracks" in the title.
@skzwitschert.bsky.social @simonplaetzer.bsky.social
@skzwitschert.bsky.social @simonplaetzer.bsky.social
January 4, 2026 at 6:51 PM
Today has been a bird day. Not only did we see no less than 5 cardinals in the tree just past our deck, but we also had a bird visitor stop by and leave some adorable footprints.
#birds #BirdTracks
#birds #BirdTracks
January 21, 2024 at 8:01 PM
Today has been a bird day. Not only did we see no less than 5 cardinals in the tree just past our deck, but we also had a bird visitor stop by and leave some adorable footprints.
#birds #BirdTracks
#birds #BirdTracks
I remember accidentally "inventing" bug/birdtrack/graphical notation while taking GR, doing a homework problem that involved a lot of dummy indices, and I wanted to stop writing more and more Greek letters. Anyway, my goto reference is @chaosbook.bsky.social's Birdtracks, birdtracks.eu
Group Theory - P. Cvitanovic
birdtracks.eu
October 6, 2025 at 1:29 PM
I remember accidentally "inventing" bug/birdtrack/graphical notation while taking GR, doing a homework problem that involved a lot of dummy indices, and I wanted to stop writing more and more Greek letters. Anyway, my goto reference is @chaosbook.bsky.social's Birdtracks, birdtracks.eu
Stay cozy today ~Gretchen
#snow #birdtracks #animaltracks #naturephotography #naturetherapy #winter #imageoftheday #photooftheday #pittsburgh #pennsylvania #westernpennsylvania
#snow #birdtracks #animaltracks #naturephotography #naturetherapy #winter #imageoftheday #photooftheday #pittsburgh #pennsylvania #westernpennsylvania
January 20, 2026 at 5:47 PM
Stay cozy today ~Gretchen
#snow #birdtracks #animaltracks #naturephotography #naturetherapy #winter #imageoftheday #photooftheday #pittsburgh #pennsylvania #westernpennsylvania
#snow #birdtracks #animaltracks #naturephotography #naturetherapy #winter #imageoftheday #photooftheday #pittsburgh #pennsylvania #westernpennsylvania
February 16, 2025 at 5:56 PM
Birdtracks conference ahead. Lots of beautiful diagrams! Register now, free of charge. Don't miss it!
indico.global/event/11678/
indico.global/event/11678/
February 28, 2025 at 8:34 AM
Birdtracks conference ahead. Lots of beautiful diagrams! Register now, free of charge. Don't miss it!
indico.global/event/11678/
indico.global/event/11678/
I promised to do it without a single formula. Might have been a lecture on Green's theorem for flux. I explained the birdtracks technology, and the rest of the lecture was only birdtracks, no letters. It was beautiful. Kiddies might be still digesting it.
October 7, 2025 at 12:27 AM
I promised to do it without a single formula. Might have been a lecture on Green's theorem for flux. I explained the birdtracks technology, and the rest of the lecture was only birdtracks, no letters. It was beautiful. Kiddies might be still digesting it.
Interestingly, the methods we start to employ for the operator constructions are best explained and analyzed using the birdrtrack formalism. Wanna know more? Join this year's birdtrack meeting indico.global/event/11678/
Birdtracks 2025
The birdtracks method allows for a concise and transparent way of calculating with tensors, with applications that reach across QCD, general relativity, differential geometry, lattice field theory, an...
indico.global
February 5, 2025 at 7:48 AM
Interestingly, the methods we start to employ for the operator constructions are best explained and analyzed using the birdrtrack formalism. Wanna know more? Join this year's birdtrack meeting indico.global/event/11678/
Bird and deer tracks in the snow! #bird #deer #birdtracks #deertracks #animals #animal #animalsofbluesky #canada #canadianphotographer #snow #nature
February 24, 2026 at 9:30 PM
Bird and deer tracks in the snow! #bird #deer #birdtracks #deertracks #animals #animal #animalsofbluesky #canada #canadianphotographer #snow #nature
In case you need something cute to look at this evening. Bird tracks.
#birds #birdtracks #nature #outdoors #wildbirds
#birds #birdtracks #nature #outdoors #wildbirds
January 21, 2025 at 10:30 PM
In case you need something cute to look at this evening. Bird tracks.
#birds #birdtracks #nature #outdoors #wildbirds
#birds #birdtracks #nature #outdoors #wildbirds
Came home to find #Pterodactyl prints in the yard! WTH? We initially thought it might be the #SandhillCranes
#BirdTracks #ColoradoWildlife #WildTurkeys #CCnDocMusic
#BirdTracks #ColoradoWildlife #WildTurkeys #CCnDocMusic
June 11, 2026 at 8:36 PM
Came home to find #Pterodactyl prints in the yard! WTH? We initially thought it might be the #SandhillCranes
#BirdTracks #ColoradoWildlife #WildTurkeys #CCnDocMusic
#BirdTracks #ColoradoWildlife #WildTurkeys #CCnDocMusic
Very cool thread! I really enjoy non-traditional applications of Feynman diagrams / diagrammatic notation more generally. You might like Birdtracks (Cvitanovic) if you haven't encountered them already (diagrammatic notation for group theory algebra; cf color flow diagrams if you've run into those)
April 28, 2026 at 3:15 AM
Very cool thread! I really enjoy non-traditional applications of Feynman diagrams / diagrammatic notation more generally. You might like Birdtracks (Cvitanovic) if you haven't encountered them already (diagrammatic notation for group theory algebra; cf color flow diagrams if you've run into those)
Hamal wooed my Radcliffe roommate when I was a senior at MIT. Three kids came out of that.
Totally a good guy, and I would even go further.
There is no supercomputer in the sky, and nature does not solve PDEs by cranking Newton-type equation forward in time.
youtu.be/oIBMTEW0Y1o?...
Totally a good guy, and I would even go further.
There is no supercomputer in the sky, and nature does not solve PDEs by cranking Newton-type equation forward in time.
youtu.be/oIBMTEW0Y1o?...
September 21, 2026 at 4:53 AM
Hamal wooed my Radcliffe roommate when I was a senior at MIT. Three kids came out of that.
Totally a good guy, and I would even go further.
There is no supercomputer in the sky, and nature does not solve PDEs by cranking Newton-type equation forward in time.
youtu.be/oIBMTEW0Y1o?...
Totally a good guy, and I would even go further.
There is no supercomputer in the sky, and nature does not solve PDEs by cranking Newton-type equation forward in time.
youtu.be/oIBMTEW0Y1o?...
We can write the general definition of the adjoint in my birdtracks-variant notation like this. The dashed lines are barred (conjugated) indices.
December 20, 2023 at 6:02 AM
We can write the general definition of the adjoint in my birdtracks-variant notation like this. The dashed lines are barred (conjugated) indices.
In a variant of so-called birdtracks notation, one may write the isometry condition as follows. Lines represent indices. The crossed line on the left indicates the "transpose-y" part of the adjoint.
December 20, 2023 at 6:01 AM
In a variant of so-called birdtracks notation, one may write the isometry condition as follows. Lines represent indices. The crossed line on the left indicates the "transpose-y" part of the adjoint.
January 7, 2025 at 1:48 AM
August 21, 2025 at 11:38 AM
Sorting out old papers and I came across my one attempt at a talk as a post-grad - acetate slides and all. It was aimed at fellow grad students, hence the not very formal language.
I'd share the text of the intro but it misgenders my late partner - so fucking bizarre to see that written down now.
I'd share the text of the intro but it misgenders my late partner - so fucking bizarre to see that written down now.
June 20, 2025 at 3:14 PM
Sorting out old papers and I came across my one attempt at a talk as a post-grad - acetate slides and all. It was aimed at fellow grad students, hence the not very formal language.
I'd share the text of the intro but it misgenders my late partner - so fucking bizarre to see that written down now.
I'd share the text of the intro but it misgenders my late partner - so fucking bizarre to see that written down now.
Bird tracks in the snow. #aprilsnow #birdtracks
November 9, 2024 at 12:53 AM
Bird tracks in the snow. #aprilsnow #birdtracks
Lots of hoppy little bird tracks all around our patio. I’ve been flying through seed. The grackles have made this place a prime hangout.
January 22, 2025 at 6:10 PM
Lots of hoppy little bird tracks all around our patio. I’ve been flying through seed. The grackles have made this place a prime hangout.