| --- Log opened Wed Feb 17 00:00:44 2021 |
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| 03:38 | | * McMartin messes around with LOGO. |
| 03:39 | <&McMartin> | It's real weird to see type-in programs from the mid-80s with tail recursion and exceptions. |
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| 09:18 | < abudhabi> | >mfw the conditional formatting on my calendar-in-spreadsheet works to detect which day it is |
| 09:19 | < abudhabi> | https://i.imgur.com/z2AlFVD.png |
| 09:20 | < abudhabi> | I was unsure whether it would re-evaluate, but it does. |
| 09:36 | <@TheWatcher> | Yay. Although I'm curious why calendar-in-spreadsheet? |
| 09:42 | <&[R]> | Excel-is-actually-good disease? |
| 09:42 | < abudhabi> | I can implement the kind of calendar I want there. |
| 09:42 | < abudhabi> | Every calendar app I've tried is rubbish for some reason or other. |
| 09:43 | < abudhabi> | (This is gnumeric, BTW, but that's just an FOSS Excel clone.) |
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| 21:47 | <~Vornicus> | sometimes, math does things that just kind of ... work out |
| 21:50 | <~Vornicus> | Okay so: in 3d vectors there's the cross product; there's a lot of ways to go about it defining it, but in the end you get a × b -> c_x = a_y b_z - a_z b_y, c_y = a_z b_x - a_x b_z, c_z = a_x b_y - a_y b_x |
| 21:50 | < McMartin> | Note that this spells XYZZY |
| 21:50 | <~Vornicus> | it is difficult to find that a coincidence but |
| 21:51 | <~Vornicus> | so you can fake this up, right, to do the same sort of thing in 2d... |
| 21:51 | <~Vornicus> | you just pretend that a_z and b_z are both 0, and then the result is just whatever c_z would be, because the other two go to zero |
| 21:53 | <~Vornicus> | So I've just learned about exterior algebra, where you get things called 2-vectors, which are actually little squarey things instead of little arrow-y things (you also get 3-vectors etc etc) |
| 21:57 | <~Vornicus> | In this you get The Wedge Product, which creates squarey things out of arrow-y things (and higher order vectors can be created too), and you get a thing called the Hodge Star, which replaces an n-vector with its complement in whatever space. |
| 21:57 | <~Vornicus> | and the wedge product and hodge star are built so that a × b = * (a ^ b) |
| 21:58 | <~Vornicus> | ...which in 2 dimensions turns out to ... get exactly the "faked up" thing I described! |
| 22:16 | < Yossarian> | actually, I found that memorizing certain fundamental identities or at least having them displayed is crucial... lots of newer textbooks will list identities but I had an issue with my discrete math text I last used that didn't list a fundamental one and I found it online instead. Definitely was true and important. |
| 22:16 | < Yossarian> | Was in the propositonal logic section of the book, so at the very beginning... depressing, modern textsbooks are. |
| 22:19 | < Yossarian> | mind, boolean algebra is isomorphic when you get on to sets |
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| --- Log closed Thu Feb 18 00:00:44 2021 |