Posts by mrdk@mathstodon.xyz
(DIR) Post #APPDiMyXX8Msl2Pk1I by mrdk@mathstodon.xyz
2022-11-05T11:16:25Z
0 likes, 0 repeats
#introductionI am a part-time mathematician and programmer, interested in #cellularautomata and a lot of other stuff. (Not a Twitter refugee.)
(DIR) Post #AQ8GB98H6l50glJQzw by mrdk@mathstodon.xyz
2022-11-30T14:34:54Z
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@Linux_in_a_Bit @ColinTheMathmo Favorited it. 🙂
(DIR) Post #AVSAVYBYpb9vpCzVgW by mrdk@mathstodon.xyz
2023-05-08T17:47:26Z
0 likes, 2 repeats
@feditips “The current total number of employees of *any kind* at Facebook/Meta is only 77,114.” —According to https://the-federation.info, the #Fediverse has currently a bit less than 24,000 nodes and therefore approximately the same number of node administrators. Most of them do the administration only part-time, but nevertheless, if we count them as employees of an imaginary “Fediverse Corporation”, this makes the Fediverse quite a big entity and of the same order of magnitude as some social media companies.This is why I view it as misleading when for example #Mastodon is described as a small project, just because the Mastodon gGmbh consists of only a handful of people.
(DIR) Post #AWrC3kPhvjuYrzdh7g by mrdk@mathstodon.xyz
2023-06-19T18:04:48Z
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@moffintosh Congratulation, you have found a new use for the Big Mac Index! 🙂 (And it is somewhat depressing news, even if already known.)
(DIR) Post #Acs6nhAGSttrhy3yT2 by mrdk@mathstodon.xyz
2023-12-16T14:18:57Z
3 likes, 11 repeats
Today is John Mastodon Day: On this day one year ago, a journalist misunderstood some facts and created the person of “John Mastodon” out of them (https://web.archive.org/web/20221216232836/https://www.mediaite.com/opinion/hypocrisy-and-fear-all-the-way-down-at-twitter). That day, the Fediverse got a new meme, a patron saint and a running gag at the same time.Let us all celebrate it!#JohnMastodonDay #JohnMastodon #Fediverse
(DIR) Post #Acs6nqsYLbfrpvqyFU by mrdk@mathstodon.xyz
2023-12-16T15:13:36Z
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And it looks that this year, John Mastodon must fight Theodore Threads. ⚔️
(DIR) Post #Ano6mgkMGZQJgSUjnU by mrdk@mathstodon.xyz
2024-11-07T18:07:13Z
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@futurebird In this case, I think that Donald Knuth is the guilty party, because he had chosen a script alphabet for TeX that insufficiently differs from the standard alphabet.Pro-tip: Have \usepackage{eucal} or even\usepackage{mathrsfs} in your LaTeX preamble for squirlier script letters.
(DIR) Post #AoMhtx0SVwC1olzP2O by mrdk@mathstodon.xyz
2024-11-24T10:43:17Z
0 likes, 1 repeats
@futurebird Well, the first point is that the function exp(ix) has an “orthogonal” growth rate, since it satisfies the equation exp(ix)' = i exp(ix)The equation says that a particle that moves along the function x ↦ exp(ix) has a speed vector that is orthogonal to its position vector. A movement along a circle around the origin of the complex plane has this property.So the idea behind is:1. The function x ↦ exp(ix) has “orthogonal growth“.2. Orthogonal growth produces circle movement.3. Circle movement produces sine and cosine.
(DIR) Post #AqJhh6aAz4l2wf4hXc by mrdk@mathstodon.xyz
2025-01-21T19:41:00Z
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@futurebird René Carmille (https://en.wikipedia.org/wiki/Ren%C3%A9_Carmille) was a French statistician during the German occupation in WW2. When ordered to prepare a list of Jewish people for deportation, he and the people of the department he headed worked as slowly and obstructively as possible, so that the report was delayed by at least two years.Carmille was finally caught, also because of other résistance activities, and died in a concentration camp. May he be well remembered.(“However, the police did not need Carmille's files. They organized raids and deportations from their own manual files.” — Yes, but we never know which effect our actions will have. If they are good, we should do them anyway.)
(DIR) Post #AquvCa0NL9rQ3IZ5cG by mrdk@mathstodon.xyz
2025-02-07T19:39:59Z
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@ColinTheMathmo Dr NIM's game must be the octal game (https://en.wikipedia.org/wiki/Octal_game) with code 0.333.Whether this helps anyone is another question.
(DIR) Post #At3A0nawFTIxo2I53Y by mrdk@mathstodon.xyz
2025-04-13T13:44:31Z
0 likes, 1 repeats
@futurebird @lillyfinch Is there an ornithological fixed point theorem? 🐦
(DIR) Post #At3AjGaZoIB0TIKDlA by mrdk@mathstodon.xyz
2025-04-13T13:52:33Z
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@futurebird @lillyfinch Maybe is is enough if the birds sing continuously. Differentiability is not needed if the ornithological fixed point theorem can be derived from Brouwer's. (So the theorem is valid even if you cannot differentiate between different birds. 🦃 🦉 🦆 🦅 🐦)
(DIR) Post #AzH31K4gQrGPu5dU4u by mrdk@mathstodon.xyz
2025-10-16T17:44:45Z
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@futurebird Here (https://www.reddit.com/r/oddlysatisfying/comments/s4kpy9/cuneiform_writing_on_a_clay_tablet) is actually an example. But an expert could write faster, I think.
(DIR) Post #B2QBlPvknGc6FZyPNQ by mrdk@mathstodon.xyz
2026-01-18T21:11:26Z
0 likes, 1 repeats
@futurebird By the way, “Consider her ways” can be found at https://gutenberg.net.au/ebooks02/0201151h.html. I will certainly have a look into it.
(DIR) Post #B2pCzlMmHxQEkJ729I by mrdk@mathstodon.xyz
2026-01-30T22:52:22Z
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@davidrevoy @khaleer And it is almost an “n” hieroglyph 𓈖 (Symbol N35 in https://en.wikipedia.org/wiki/List_of_Egyptian_hieroglyphs#N). If a symbol is simple enough, it appears everywhere!