Fulltime freelance provider of outreach and enhancement in maths ... I talk a lot. About maths.
Public Key
npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk
Profile Code
nprofile1qqs9e5j9tyz29f7jxpjprpl80w7n3nneq6cs3m4k738zxk8jlvnwldcpz4mhxue69uhhyetvv9ujumt0wd68ytnsw43q4sum9w
Author Public Key
npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Show more details
Published at
2023-03-27T21:43:19+02:00 Event JSON
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"created_at": 1679946199 ,
"kind": 0 ,
"tags": [
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"mostr",
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"content": "{\"name\":\"Colin the Mathmo\",\"about\":\"Fulltime freelance provider of outreach and enhancement in maths ... I talk a lot. About maths.\\n\\nI talk about other stuff too, like ballroom dancing, juggling, unicycling, education, engineering, software, and \\\"other things\\\".\\n\\nBut mostly about maths.\\n\\nI tend to follow back, but only if you have something in your profile.\",\"picture\":\"https://media.mathstodon.xyz/accounts/avatars/000/000/013/original/d3bb832f7c670bec.png\",\"nip05\":\"[email protected] \"}" ,
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Last Notes npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo Had an interesting discussion earlier as to whether a cube is a prism. npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo Grrr ... affixes ... npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo I used to be indecisive. Now I'm not so sure. -- Tommy Cooper(?) npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub1knz…c73p And this one ... you've got me going down the rabbit hole now. npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub1knz…c73p Mesmerising ... npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo This always makes me smile. Always. npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo Quoting: npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo The last sentence is significant: npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo Anyone know the name of this shape? I know I should know, but I've never had any luck trying to remember all the names of all the shapes ... npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub1xpc…3t05 Obtained from there: npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo I love watching, on another site, people missing the point *entirely* ... npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub1ead…f20t Woo Hoo !!! npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub1h5k…q0tu npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo Some people, when confronted with a problem, think 'I know, I'll use multi-threading'. Nothhw tpe yawrve o oblems. -- Eiríkr Åsheim (https://twitter.com/d6/status/160439872828620800) npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub1nad…2adz ... but the answer is now found, the Moon's diameter is a thousand times bigger ... 3475 km, not 3475 m. npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub16ru…m0h5 Yup. npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub1jwl…5rwk Yup ... exactly right. npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub1yzg…3zfx Hah !!! npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub1nad…2adz Close to the horizon there are atmospheric effects that screw with the numbers, so while I agree with your intuition, your evidence is not as convincing as you might hope. npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub1h26…dd84 Completely clouded out here. npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo Distance to the Moon is about 390 Megameters, time to orbit is 27.32 days, so speed in m/s is: npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo Can someone check my answer: npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo In about half an hour, #UK_ISS #ISS pass, starting at 21:22:15, duration 130 secs, bright, Magnitude -2.5 npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo Documenting this so I can come back to it later: npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo Some passes of the #ISS visible from the UK overnight - I'll post alerts closer to the time - #UK_ISS npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo Whiteboards are remarkable. npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo Mathematicians solve a 50 year-old Moebius Strip puzzle: npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo All mushrooms are edible; but some only once. -- Various attributions, mostly as Eastern European sayings npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub1lx7…ejfr Super ... thanks. npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub1gca…263w Confirmation would be super ... thank ... but don't spend too much time on it. npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo This is not the real question ... the real question might be coming soon. But first ... npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo I thought I'd share this. Julia is well-known in the education community, to which she has contributed enormously. npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo Some passes of the #ISS visible from the UK overnight - I'll post alerts closer to the time - #UK_ISS npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo Is there a way to invoke firefox from shell to: npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo From this thread I'm learning much more than I ever wanted to know about PDFs: npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub1zs8…vzdu Americans don't seem to have kettles. npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo Worryingly accurate:[email protected] /110986377207659263 npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub1k49…y4l9 Hello!! npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo I recently decided to sell my vacuum cleaner - all it was doing was gathering dust. -- Tim Vine npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub15wp…3a95 @npub1cn9…9nha Best explained with a picture, but can't do that now, so here's a description. npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo Someone at @npub1cn9…9nha solved the cow problem! npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo The biggest waste of time is to do well something that we need not do at all. -- Gretchen Rubin, 'Better Than Before' npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub1uhn…2f8t Nice one ... npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub1fkr…jgm8 Gosh ... that's astonishing. npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub1fkr…jgm8 I find that very surprising. Can you show me 5 or 6 examples? npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo Here's a challenge for my mathsy people here on Mathstodon ... npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo Q: What do you get when you cross a mosquito with a mountaineer? A: Nothing - you can't cross a vector with a scalar. npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo I don't understand why this misconception happens: npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub1jzg…hc3a Just to let you know that I charted all the answers to your question about setting up a thread of posts on Mastodon ... you can find it here: npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub1zs8…vzdu It's running on a hard surface, so that's not a problem. I ran the temp checkers, results shown. npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub1zs8…vzdu Temperature there is very similar to temperature here ... comfortable room temperature,around 18 degrees. npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub1zs8…vzdu Well, it appears not to have solved the problem. Worked fine here ... machine now returned, fans spinning up again. npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub1zs8…vzdu This is a recent phenomenon, not obviously related to any other changes. npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub17v5…nhl0 I no longer have access to the W10 USB image ... that was the people who popped the covers and did the clean. As I've said elsewhere, I'm not really a computer person. npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub1xt7…aztg I'm a grumpy old grey beard ... npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub17v5…nhl0 My concern is that (apparently) nothing has changed recently, but the fans have started to do this. npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo Calling @npub12ta…nf76 ... npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub1xt7…aztg Indeed ... "top" and "xload" have shown virtually zero CPU usage. npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub1gw2…f526 First produces "powersave" npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub1gw2…f526 I've installed TLP and the fans have spun down. npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub1gw2…f526 I don't know ... is there an easy way to find out? npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub1gw2…f526 That would be a good call ... I can see that on my 22.04 machine, but not in the menus on the 20.04 machine that's having the trouble. npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo Tech help needed! npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub179d…8nud Chart updated (That requires me to do it ... there is currently no user-accessible way to trigger a refresh) npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo This screen shot is from https://www.justsecurity.org/87615/changes-to-uk-surveillance-regime-may-violate-international-law/ npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo Note to self: All you have to do is show up. Be late. Be scared. Be a mess. Be weird. Be confused. Just BE there. You'll figure out the rest as you go. -- Nanea Hoffman npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo Life appears to me too short to be spent in nursing animosity, or registering wrongs. -- Charlotte Bronte, in Jane Eyre npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub1h4t…0mz2 Not at all ... sometimes it's worth being explicit, just to be sure. I'd prefer that than to finding that there's been a misunderstanding down the line. npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub10w3…tmd0 That's a nice one! npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo This is reasonably easy ... can you find a solution that's "interesting"? npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo For those who are interested, a Countdown Numbers Challenge. npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo Normal DHL operations: npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub1qpu…d95n Happy to double the "u", as in "vacuum" and "continuum", but when following the "q" it doesn't "feel right" to me. npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub1qpu…d95n I'm following the pattern in English for the "strong form" (I believe it's called): npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub1h4t…0mz2 Sorry, completely unfair of me. npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub1psd…9sr7 As mentioned on -Twitter- ... sorry, X ... npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo OK, why was that not a foul? npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo If our brains were simple enough for us to understand them, we'd be so simple that we couldn't. -- Ian Stewart npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub1zqa…w53y The discussion there says that he may well have been the first person to hear the message that told of Stalin's death, but that the message was likely in code, possibly encyphered, so while he may have heard the message, it was unlikely he understood it. npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo Before he was a famous musician, Johnny Cash was a military code breaker for the US Air Force. npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub1uhn…2f8t ot Windows, I'm running Ubuntu 22.04. And it looks complicated to get the appropriate auth cookies, etc. However, the "Copy to curl" option from Dev Tools worked a treat. npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub164y…cvs5 I have no knowledge of Ruby at all, so I've made a note of the suggestion in case I get the chance to come up to speed with that, but the "copy as curl" has done the trick for now. npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub1s92…q7h9 Yeah ... I've been trying to avoid both of those. I tried passing "--user" and "--password" to wget on the CLI, but that didn't work. Finding the cookie might, as you say, be the way to do it, but I'm not a web dev, so using dev tools to sniff that is something I'd need to work out. npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo Asking tech people who know more about this sort of thing than I do (which admittedly isn't hard) ... npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo Seen on Mathstodon: I ordered a donut and a cup of coffee at the Topology Cafe and they gave me two hula hoops. (by https://mathstodon.xyz/@EdisonMaxwell) npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo Some passes of the #ISS visible from the UK overnight - I'll post alerts closer to the time - #UK_ISS npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub18ad…pl7t "Squint" is no longer used (in general) to refer to cross-eyed or different direction viewing. It's now used like this: npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo @npub18ad…pl7t Random thoughts ... npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo Some passes of the #ISS visible from the UK overnight - I'll post alerts closer to the time - #UK_ISS npub1tnfy2kgy52nayvryzxr7w7aa8r88jp43prhtdazwydv097exa7ms8j5nzk Colin the Mathmo Cunningham's Law: The best way to get the right answer on the internet is not to ask a question; it's to post the wrong answer.
