herid @herid@qoto.org
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Refugee from twitter. I am into math, tech, clean energy, EVs, COVID info, books, movies, music.
Based in Toronto. Support Ukraine.
Boosts=endorsements twitter:https://twitter.com/heridfan
Joined Nov 2022
#Russia is turning into Iran. Religious right in US is burning with envy.
@reuters@news.twtr.plus
Russia's parliament passed the third and final reading of a law that expands an existing ban on promoting ‘LGBT propaganda’ to children by banning ...
Paul Simon - 50 Ways to Leave Your Lover
in honor of this toot
https://mastodon.scot/@jonreed/109400665716703959
#FavoriteMusic 14/
herid
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He Made a Woman out of Me
There are various covers of this song but this is the one I like best.
#FavoriteMusic 13/
@mhmck is there a mechanism to expel a country from NATO? Hungary should be expelled if possible.
herid
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Elon Musk plans to reinstate nearly ALL previously banned Twitter accounts — to the alarm of activists and online trust and safety experts. The decision will have dangerous consequences, particularly for vulnerable communities. https://www.washingtonpost.com/technology/2022/11/24/twitter-musk-reverses-suspensions/ #twitter #twittermigration #tech #technology #elon #TwitterMigrate
herid
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50 WAYS TO LEAVE YOUR TWITTER
You just pin your last tweet, Pete,
Request your archive, Clive,
You don’t need a blue tick, Vic,
Just get yourself free.
Hop on the tusk, Gus,
You don’t need to delete much,
Except your DMs, Jen,
And get yourself free.
Use Debirdify, Di,
Provide some alt tags, Mags,
Add a content warning, Tim,
To post sensitively.
Remember to boost, Ruth
You don't need to deny truth,
Just drop off the perch, Dirk,
And get yourself free.
#VerseThurday #TwitterMigration #FediTips
herid
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One of the quirks of professional mathematics is that researchers are discouraged from speculating too far beyond the range of what they can actually prove. To quote Minhyong Kim (from https://mathoverflow.net/a/38694/766): "it's almost as though definite mathematical results are money in the bank. After you've built up some savings, you can afford to spend a bit by philosophizing. But then, you can't let the balance get too low because people will start looking at you in funny, suspicious ways."
@johncarlosbaez I think my last conjecture is correct. a quaternion algebra in octonions is generated by two unit orthogonal imaginary octonions. that gives dimension of such algebras as 6+5-3=8 (we have to substract 3=dim Sp(1)). and G_2 as the group of automorphisms of octonions obviously acts on the set of such algebras transitively. the stabilizer of a point is 6 dimensional so can only be SO(4) we want. it now should be possible to see it more directly.
@johncarlosbaez I am really not an expert on this subject but this is well known and I think there are explicit ways to see it. on the level of lie algebras this is easy from looking at the root system and the Weyl group which is D_6. it contains reelections in two perpendicular lines and that gives the inclusion of the correct lie algebra. not sure what the best what to see that it gives SO(4) and not S^3\times S^3. I think if you look a little more closely you see that the diagonal subalgebra in it sits su(3). the corresponding subgroup is the obvious SO(3) in SU(3). there is no SO(3) in S^3\times S^3 so it is ruled out. But as I said this ought to be well known. G_2/SO(4) is a symmetric space so there should be a nice description of it like you wanted. I think it might be the same as the set of quaternion subalgebras of octonions on which G_2 acts transitively.
herid
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There’s no incentive for people who follow you on Twitter to leave & follow you here instead if you keep posting on Twitter. Take a leap of faith.
@johncarlosbaez sorry, I don't know the answer to this although I am sure this is known. you may want to ask on mathoverflow. in any even as I said it's easy to rule out that inner automorphisms of octonions are contained in SO(4). they are both closed 6 manifolds, the former being S^6 and and there is no embedding of S^6 into SO(4) for easy topological reasons (it would have to be a homeomorphism).
He Made a Woman out of Me
There are various covers of this song but this is the one I like best.
#FavoriteMusic 13/
herid
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herid
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"In the U.S.’s efforts to 'move on' from thinking about #Covid, it has created a 'new normal' that is deeply abnormal — one in which we normalize resorting to crisis measures, such as treating patients in tents, instead of using common-sense public health strategies. Treating Covid like the flu — or the #flu like Covid — has effectively meant that we treat neither illness as if it were a serious threat to health systems and to public health."
https://www.statnews.com/2022/11/22/tripledemic-hurricane-include-community-prevention-efforts/
@BenHouston3D @jamesjefferies The atmosphere will gradually slow it down. Apollo missions had similar reentry speeds.
https://en.wikipedia.org/wiki/Atmospheric_entry#Real_(equilibrium)_gas_model
herid
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The flight of NASA's Artemis (purple) uses two very close encounters with the moon's gravity (green) to changes its trajectory to get back to the earth (blue.) Amazing.
@irgarner this is what is so disheartening about **all** such videos. In none of them that I have seen do they complain about being sent to attack another country which has don't nothing to Russia.
#StandWithUkraine
@Billius27@mstdn.ca this #WorldCup is certainly serving up some surprises.
@Ainsley yes, many people made mastodon accounts just in case but are not using them. I used deberdify
https://debirdify.pruvisto.org/
to find many of the people I follow on twitter on mastodon. I rerun it every day as this number is slowly growing.
@Ainsley @digits @trinsec @adambunch
Thanks. I didn't know as he doesn't have it in his twitter bio and never mention in his tweets. He doesn't appear to be using the account. As suggested I did ask him on twitter to start posting on Mastodon.
- Planet
- Earth
- Country
- Canada
Refugee from twitter. I am into math, tech, clean energy, EVs, COVID info, books, movies, music.
Based in Toronto. Support Ukraine.
Boosts=endorsements twitter:https://twitter.com/heridfan
Joined Nov 2022
