the binary thing is how you'd do multiplication in z80 assembly language where the instruction set only had addition and shifting (shiting right === integer division by 2)
yes, even numbers thing is a bit odd. it will map to the binary representation, but i'm not sure how yet
― koogs, Friday, 7 February 2020 12:31 (four years ago) link
ah, odd just means that you have a remainder when dividing by 2
so his 121 = odd, even, even, odd, odd, odd
or, reading from bottom up, 1111001 = 64 + 32 + 16 + 8 + 1 = 121
― koogs, Friday, 7 February 2020 12:34 (four years ago) link
(i can imagine trying to explain who johnny ball is to my younger colleagues in terms of being zoe ball's dad, only to then have to explain who zoe ball is)
― koogs, Friday, 7 February 2020 12:36 (four years ago) link
I'm fleeing America for the sole reason that we (now they) don't say "maths"
― otm into winter (rip van wanko), Saturday, 8 February 2020 04:42 (four years ago) link
good riddance, pervert
― j., Saturday, 8 February 2020 04:45 (four years ago) link
The biggest AmE/BrE mystery is why it’s “math” and “sports” vs “maths” and “sport”
― Swilling Ambergris, Esq. (silby), Saturday, 8 February 2020 06:41 (four years ago) link
if not for cricket we would be able to make progress on that mystery by looking into sabermetric
― j., Saturday, 8 February 2020 06:44 (four years ago) link
in the video, he's solving using only the figures in the right column. what do you do with the left column? i missed it somehow
― otm into winter (rip van wanko), Saturday, 8 February 2020 14:31 (four years ago) link
j., idgi?
lol i had the same moment rvw
i hope that hes referring to johnny ball
― BSC Joan Baez (darraghmac), Saturday, 8 February 2020 14:40 (four years ago) link
frustrating that he uses the same numbers for his second example lol
― otm into winter (rip van wanko), Saturday, 8 February 2020 14:42 (four years ago) link
and the left column will invariably resolve to 1... OH it's just used to produce even numbers so you can scratch out the corresponding number on the right, ok
― otm into winter (rip van wanko), Saturday, 8 February 2020 14:44 (four years ago) link
RIP, JHC.
― Three Hundred Pounds of Almond Joy (James Redd and the Blecchs), Sunday, 12 April 2020 13:17 (four years ago) link
Perhaps I shouldn't post about it, but Euler has a very impressive ancestor in his genealogy.
― Time Will Show Leo Weiser (James Redd and the Blecchs), Tuesday, 28 July 2020 18:00 (three years ago) link
Do you mean me or my namesake? True in both cases...
― Joey Corona (Euler), Tuesday, 28 July 2020 19:29 (three years ago) link
Ha, meant you, had almost forgotten about the original’s tutor.
― Time Will Show Leo Weiser (James Redd and the Blecchs), Tuesday, 28 July 2020 20:06 (three years ago) link
My philosophy advisor's advisor was one of Trotsky's bodyguards!
― Joey Corona (Euler), Wednesday, 29 July 2020 13:38 (three years ago) link
True in both cases...
Heh, now I'm intrigued.
― pomenitul, Wednesday, 29 July 2020 14:02 (three years ago) link
On my math side you get to Tarski, Brentano, Copernicus, Regiomontanus, and Oresme. On my philo side you get the aforementioned Trotsky bodyguard (that's van Heijenoort), Pólya, Hilbert , Weierstrass, Gauss, Lagrange, Euler (!!!), Malebranche, and Leibniz.
I'm my own grandpa
― Joey Corona (Euler), Wednesday, 29 July 2020 14:23 (three years ago) link
In that case maybe you belong on this thread
― Time Will Show Leo Weiser (James Redd and the Blecchs), Wednesday, 29 July 2020 14:45 (three years ago) link
Is there a button on the genealogy project to see the trunk of the tree going back? I am blind and did not see.
― Time Will Show Leo Weiser (James Redd and the Blecchs), Wednesday, 29 July 2020 14:46 (three years ago) link
I don't know. I just follow the links back and back.
― Joey Corona (Euler), Wednesday, 29 July 2020 14:47 (three years ago) link
I wasn't really cut out to be an academic- I went back to grad school later in life and wasn't really in quite the right subject. Upon reflection many of my cohort of mathletes didn't go on to become research mathematicians - with some notable exceptions of course! My advisor was a nice guy but didn't really push, although he did get most other people through to the PhD but not to any big jobs that I know of. Sometimes I slightly regret I didn't try to work with the one guy whose father won a Nobel Prize or the other guy with an Erdős number of one.
― Time Will Show Leo Weiser (James Redd and the Blecchs), Wednesday, 29 July 2020 15:01 (three years ago) link
That's how it is for most people. I chose my grad institution knowing that it was really only good in the one area I wanted to study, so it's a good pedigree even if I'd studied, like, number theory it would have been a trash place to be. (Or any other discipline except philo & theology, it's not a very good place to do grad work in general, but it's a wealthy place so it worked out.) The big advantage of my well-established advisors was that they taught me, from my 2nd year on, how to talk to big shots, the senior faculty at other universities that I'd meet at conferences. I.e. networking, still the most important skill I learned aside from first-order "here's how you solve a problem" etc.
― Joey Corona (Euler), Wednesday, 29 July 2020 15:06 (three years ago) link
ILX - COVID-77
― Time Will Show Leo Weiser (James Redd and the Blecchs), Sunday, 2 August 2020 02:29 (three years ago) link
Woke up in the middle of the night and thought about R. L. Moore for a second. Ugh.
― Isinglass Ponys (James Redd and the Blecchs), Sunday, 16 August 2020 08:37 (three years ago) link
Now thinking about Paul Garabedian, a more pleasant memory.
― Isinglass Ponys (James Redd and the Blecchs), Sunday, 16 August 2020 09:01 (three years ago) link
what's wrong with Moore?
I had at least one undergrad prof who'd been a doctoral student of his. He told us a story of how, when Moore taught courses to engineers, he'd bring a loaded gun to class, and told the engineers that if any of them asked a question in class, he'd shoot them.
― Joey Corona (Euler), Sunday, 16 August 2020 11:52 (three years ago) link
Heard a similar story from that son of a Nobelist I mentioned. Applied mathematician is hired at UT Austin. Shows up for first semester of work, is greeted by R. L. Moore sitting there with a shotgun his lap. “What are you doing here, son?” “I came to teach <insert applied math subject here>.”“Oh no you aren’t.”
― Isinglass Ponys (James Redd and the Blecchs), Sunday, 16 August 2020 14:06 (three years ago) link
haha
― Joey Corona (Euler), Sunday, 16 August 2020 14:09 (three years ago) link
what's wrong with Moore?I had at least one undergrad prof who'd been a doctoral student of his. He told us a story of how, when Moore taught courses to engineers, he'd bring a loaded gun to class, and told the engineers that if any of them asked a question in class, he'd shoot them.
Posts Whose Second Paragraph Answers The Question Raised In Their First Paragraph
― Guayaquil (eephus!), Sunday, 16 August 2020 15:10 (three years ago) link
;)
― Joey Corona (Euler), Sunday, 16 August 2020 15:25 (three years ago) link
RFI: best way to express a half open range in a non-or-quasi-mathematical setting.
― Two Little Hit Parades (James Redd and the Blecchs), Monday, 31 August 2020 16:09 (three years ago) link
maybe...
integers: "x, x+1 ... y-1"reals: "from x up to but not including y"
but if "quasi-mathematical" is like programmers or physicists then [x, y) is understood or quickly understandable for both integers and reals, and certainly a <= x < b is fine.
― 𝔠𝔞𝔢𝔨 (caek), Monday, 31 August 2020 16:31 (three years ago) link
not exactly what you're looking for but maybe useful
https://www.cs.utexas.edu/users/EWD/transcriptions/EWD08xx/EWD831.html
Thanks, already went with your last suggestion.
― Two Little Hit Parades (James Redd and the Blecchs), Monday, 31 August 2020 18:07 (three years ago) link
HI DERE!
― Erdős-szám 69 (James Redd and the Blecchs), Saturday, 26 September 2020 22:55 (three years ago) link
Does anyone read the Cantor’s Paradise section of Medium?
― Here Comes a Slightly Irregular (James Redd and the Blecchs), Saturday, 17 October 2020 12:57 (three years ago) link
never heard of it before, but just read this nice post on concentration bounds https://medium.com/cantors-paradise/concentration-of-measure-the-glorious-chernoff-bound-1e96777cc29d
― flopson, Sunday, 18 October 2020 01:16 (three years ago) link
The few things I’ve read have been pretty good so far.
― Here Comes a Slightly Irregular (James Redd and the Blecchs), Sunday, 18 October 2020 01:21 (three years ago) link
Twitter programming language enthusiasts are the absolute worst promoters of category theory applicability.
― Allen (etaeoe), Sunday, 30 May 2021 21:10 (two years ago) link
Who's the picture at the top of this thread a picture of?
― Guayaquil (eephus!), Sunday, 30 May 2021 21:16 (two years ago) link
https://www.youtube.com/watch?v=sdlWiDgvjAY
― flopson, Sunday, 30 May 2021 21:21 (two years ago) link
sometimes things work out well:
I taught a course in computational algebraic geometry this summer.To high school students.Here's how it went.https://t.co/fCASlEoExx— Bill Shillito (@solidangles) August 3, 2021
― mark s, Wednesday, 4 August 2021 12:57 (two years ago) link
Good stuff, especially leading up to this:
In short, we need to stop conflating logical foundation with pedagogical foundation.
― Two Severins Clash (James Redd and the Blecchs), Wednesday, 4 August 2021 14:16 (two years ago) link
I think this is good but I also think it is super unclear to me that "pedagogical strategies that work well in a small group of student selected specifically as self-motivated high math achievers" has THAT much to say about what K-12 should be doing generally. And of course the idea that school math should involve playing around, discovery, "why do we do it this way? what if we did it this other way? if that doesn't work, what went wrong?" rather than "follow these rules to get the answer" is exactly the aspect of Common Core that was hated by legislators and parents and to be frank lots of kids (though I still can't help feeling there has to be a way to do it right.)
― Guayaquil (eephus!), Wednesday, 4 August 2021 14:35 (two years ago) link
Fair enough.I want to look at his divide by zero thing later.
― Two Severins Clash (James Redd and the Blecchs), Wednesday, 4 August 2021 14:40 (two years ago) link
never divide by zero, it always ends badly
― mark s, Wednesday, 4 August 2021 14:55 (two years ago) link
and yes, it absolutely depends on this being a schoolroom of the self-selectedly curious in a territory where the outcome stakes aren't especially high yet (in a bridge-will-fall-down car-will-catch-fire sense)
― mark s, Wednesday, 4 August 2021 14:58 (two years ago) link
― Two Severins Clash (James Redd and the Blecchs), Wednesday, 4 August 2021 15:00 (two years ago) link