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Notices by rtsn (rtsn@gnusocial.de), page 15

  1. rtsn (rtsn@gnusocial.de)'s status on Wednesday, 31-Jan-2018 14:23:51 EST rtsn rtsn
    in reply to
    • therubackup
    @theru yeah it really sucks but I'll manage :). I guess life just is hard sometimes
    In conversation Wednesday, 31-Jan-2018 14:23:51 EST from gnusocial.de permalink
  2. rtsn (rtsn@gnusocial.de)'s status on Wednesday, 31-Jan-2018 14:22:53 EST rtsn rtsn
    in reply to
    • Marcus
    @marcus thank you :)
    In conversation Wednesday, 31-Jan-2018 14:22:53 EST from gnusocial.de permalink
  3. rtsn (rtsn@gnusocial.de)'s status on Wednesday, 31-Jan-2018 14:06:40 EST rtsn rtsn
    one day after I got the news that my friend died someone in my family got a massive stroke. kind of a hard week. at least my courses are fun
    In conversation Wednesday, 31-Jan-2018 14:06:40 EST from gnusocial.de permalink
  4. rtsn (rtsn@gnusocial.de)'s status on Wednesday, 31-Jan-2018 14:04:12 EST rtsn rtsn
    in reply to
    • Biene Zwo Old account
    @einebienezwo thank you
    In conversation Wednesday, 31-Jan-2018 14:04:12 EST from gnusocial.de permalink
  5. rtsn (rtsn@gnusocial.de)'s status on Monday, 22-Jan-2018 13:38:31 EST rtsn rtsn
    Just got word that a friend of mine died a couple of days ago in an overdose :(
    In conversation Monday, 22-Jan-2018 13:38:31 EST from gnusocial.de permalink
  6. rtsn (rtsn@gnusocial.de)'s status on Monday, 22-Jan-2018 03:25:08 EST rtsn rtsn
    • Michael F. Lamb
    @datagrok If I were let into this magnificent room I most likely never could make myself to leave it
    In conversation Monday, 22-Jan-2018 03:25:08 EST from gnusocial.de permalink
  7. rtsn (rtsn@gnusocial.de)'s status on Monday, 22-Jan-2018 02:36:33 EST rtsn rtsn
    • sireebob
    • gid
    @gid @sireebob sorry I didn't get it
    In conversation Monday, 22-Jan-2018 02:36:33 EST from gnusocial.de permalink
  8. rtsn (rtsn@gnusocial.de)'s status on Saturday, 20-Jan-2018 17:06:21 EST rtsn rtsn
    • Zillion
    @zillion Yeah I've considered a VPS but decided against it due to paranoia and the need/will to control my own stuff to the highest degree possible. Things actually worked it pretty nicely by just connecting my raspi to the internet via ethernet cable rather than via wifi. :)
    In conversation Saturday, 20-Jan-2018 17:06:21 EST from gnusocial.de permalink
  9. augustus pugin (augustus@shitposter.club)'s status on Saturday, 20-Jan-2018 13:47:30 EST augustus pugin augustus pugin
    after extensive investigation, the Russian linked propaganda accounts on GNU Social can be named as follows:

    - me
    - dad
    - shp probably
    - dtluna
    - bob mottram

    this concludes the announcement
    In conversation Saturday, 20-Jan-2018 13:47:30 EST from shitposter.club permalink Repeated by rtsn
  10. rtsn (rtsn@gnusocial.de)'s status on Saturday, 20-Jan-2018 14:13:50 EST rtsn rtsn
    • Mathematics
    This is pretty neat: https://jeremykun.com/2017/07/24/boolean-logic-in-quadratic-polynomials/ !math 
    In conversation Saturday, 20-Jan-2018 14:13:50 EST from gnusocial.de permalink

    Attachments

    1. File without filename could not get a thumbnail source.
      Boolean Logic in Polynomials
      By j2kun from Math ∩ Programming

      Problem: Express a boolean logic formula using polynomials. I.e., if an input variable is set to , that is interpreted as false, while is interpreted as true. The output of the polynomial should be 0 or 1 according to whether the formula is true or false as a whole.

      Solution: You can do this using a single polynomial.

      Illustrating with an example: the formula is also known as

      not((a or b) and (not c or d))

      The trick is to use multiplication for “and” and for “not.” So would be , and would be . Indeed, if you have two binary variables and then is 1 precisely when both are 1, and zero when either variable is zero. Likewise, if is zero and zero if is one.

      Combine this with deMorgan’s rule to get any formula. translates to . For our example above,

      Which expands to

      If you plug in you get True in the original formula (because “not c or d” is False), and likewise the polynomial is

      You can verify the rest work yourself, using the following table as a guide:

      0, 0, 0, 0 -> 1
0, 0, 0, 1 -> 1
0, 0, 1, 0 -> 1
0, 0, 1, 1 -> 1
0, 1, 0, 0 -> 0
0, 1, 0, 1 -> 0
0, 1, 1, 0 -> 1
0, 1, 1, 1 -> 0
1, 0, 0, 0 -> 0
1, 0, 0, 1 -> 0
1, 0, 1, 0 -> 1
1, 0, 1, 1 -> 0
1, 1, 0, 0 -> 0
1, 1, 0, 1 -> 0
1, 1, 1, 0 -> 1
1, 1, 1, 1 -> 0

      Discussion: This trick is used all over CS theory to embed boolean logic within polynomials, and it makes the name “boolean algebra” obvious, because it’s just a subset of normal algebra.

      Moreover, since boolean satisfiability—the problem of algorithmically determining if a boolean formula has a satisfying assignment (a choice of variables evaluating to true)—is NP-hard, this can be used to show certain problems relating to multivariable polynomials is also hard. For example, finding roots of multivariable polynomials (even if you knew nothing about algebraic geometry) is hard because you’d run into NP-hardness by simply considering the subset of polynomials coming from boolean formulas.

      Here’s a more interesting example, related to the kinds of optimization problems that show up in modern machine learning. Say you want to optimize a polynomial subject to a set of quadratic equality constraints. This is NP-hard. Here’s why.

      Let be a boolean formula, and its corresponding polynomial. First, each variable used in the polynomial can be restricted to binary values via the constraint .

      You can even show NP-hardness if the target function to optimize is only quadratic. As an exercise, one can express the subset sum problem as a quadratic programming problem using similar choices for the constraints. According to this writeup you even express subset sum as a quadratic program with linear constraints.

      The moral of the story is simply that multivariable polynomials can encode arbitrary boolean logic.

  11. Open Culture (openculture@tooot.im)'s status on Saturday, 20-Jan-2018 14:00:15 EST Open Culture Open Culture

    Celebrate the Women’s March with 24 Goddess GIFs Created by Animator Nina Paley.

    They’re Free to Download and Remix http://bit.ly/2FUetaV https://t.co/JQRhkIesy0

    In conversation Saturday, 20-Jan-2018 14:00:15 EST from tooot.im permalink Repeated by rtsn

    Attachments

    1. File without filename could not get a thumbnail source.
      Celebrate the Women's March with 24 Goddess GIFs Created by Animator Nina Paley: They're Free to Download and Remix
      By Ayun Halliday from Open Culture
      Celebrate the Women’s March with 24 Goddess GIFs Created by Animator Nina Paley: They’re Free to Download and Remix
  12. rtsn (rtsn@gnusocial.de)'s status on Saturday, 20-Jan-2018 14:09:55 EST rtsn rtsn
    • axolotl
    @axolotl ohai & moin!
    In conversation Saturday, 20-Jan-2018 14:09:55 EST from gnusocial.de permalink
  13. rtsn (rtsn@gnusocial.de)'s status on Saturday, 20-Jan-2018 11:25:43 EST rtsn rtsn
    in reply to
    • A Roaming Geek
    @aroaminggeek Afrin
    In conversation Saturday, 20-Jan-2018 11:25:43 EST from gnusocial.de permalink
  14. rtsn (rtsn@gnusocial.de)'s status on Saturday, 20-Jan-2018 07:11:54 EST rtsn rtsn
    https://newhumanist.org.uk/articles/5208/what-makes-maths-beautiful
    In conversation Saturday, 20-Jan-2018 07:11:54 EST from gnusocial.de permalink

    Attachments

    1. Invalid filename.
      What makes maths beautiful?
      For an experienced mathematician, the greatest equations are beautiful as well as useful. Can the rest of us see what they see?
  15. rtsn (rtsn@gnusocial.de)'s status on Saturday, 20-Jan-2018 07:11:54 EST rtsn rtsn
    Fuck Turkey
    In conversation Saturday, 20-Jan-2018 07:11:54 EST from gnusocial.de permalink
  16. rtsn (rtsn@gnusocial.de)'s status on Friday, 19-Jan-2018 13:57:51 EST rtsn rtsn
    in reply to
    • Kevie
    @kevie Oh I see, sorry about that!
    In conversation Friday, 19-Jan-2018 13:57:51 EST from gnusocial.de permalink
  17. rtsn (rtsn@gnusocial.de)'s status on Friday, 19-Jan-2018 13:56:49 EST rtsn rtsn
    differential deRham chain cocomplex. errrhm sounds simple enough (nope). algebraic topology is gonna take some time and real effort on my part.
    In conversation Friday, 19-Jan-2018 13:56:49 EST from gnusocial.de permalink
  18. rtsn (rtsn@gnusocial.de)'s status on Friday, 19-Jan-2018 13:52:10 EST rtsn rtsn
    in reply to
    • Biene Zwo Old account
    @einebienezwo finding motivation can be so hard. by risking stating the obvious it sometimes helps me to start with something small and easy and then trick myself by gradually working my way up to the important stuff. sometimes it even works :)
    In conversation Friday, 19-Jan-2018 13:52:10 EST from gnusocial.de permalink
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