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ovdv:
fucking young adult novels make it difficult to look up “divergent series"

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11:46 PM | littlelimpstiff14u2:
Wavegrower
...

littlelimpstiff14u2:
Wavegrower
Oscillations - Harmony - Unity
I’m Frédéric Vayssouze-Faure, a french guy fascinated by wave phenomenons and the vibrating guitar string harmonics theory,
therefore inspired by periodic motions in general, and by the purest
and smoothest of them in particular : those which
[…]

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11:22 AM | Maths Mr. Men Sticker Template

With many thanks to @luby_lou99 who made these entirely independently. They’re very cool, and more cost efficient than the ones I made for my classes! Maths Mr Men Sticker Template Just use the template and get some stickers like these (or on ebay here) :D

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12:00 AM | Telephone Keypad Design

Why are the push buttons on a telephone arranged the way they are?

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curiosamathematica:
The sums of the reciprocals of the binomial coefficients over successive diagonals in Pascal’s triangle converge into beautiful patterns, apart from the first and second diagonal (which lead to the series 1 + 1 + 1 + 1 + … and the harmonic series, respectively).
A proof of the identity can be found on cut-the-knot.org.

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Named after the grid system Thomas Jefferson used to apportion land acquired through the Louisiana purchase, the Jefferson Grid Instagram account highlights remnants of the system through satellite shots from…Tags: grid, Thomas Jefferson

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7:20 PM | Wheel and Pomegranate

Wheel and Pomegranate
by Alexander Mayorov
http://im-possible.info/english/art/various/alexander-mayorov.html

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6:01 PM | Volumes

(Click on the comic if you can't see the full image.) (C)Copyright 2015, C. Burke.Shouldn't Volume 6 be three times as meaty as Volume 2? Assuming some books aren't denser than others, of course. Again, there are times I'm surprised that I haven't done jokes like this one before. Come back often for more funny math and geeky comics.

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7:01 AM | Minimum Wage Machine pays in pennies

Crank to earn a penny every 4.5 seconds.Tags: minimum wage, perspective

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curiosamathematica:
The sums of the reciprocals of the binomial coefficients over successive diagonals in Pascal’s triangle converge into beautiful patterns, apart from the first and second diagonal (which lead to the series 1 + 1 + 1 + 1 + … and the harmonic series, respectively).
A proof of the identity can be found on cut-the-knot.org.

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8:48 PM | Google Summer of Code 2015

GeoGebra Summer of Code 2015 This summer, GeoGebra was again part of Google Summer of Code (GSoC) supporting young and talented open source coders. We had a very strong field of 64 students applying and were able to choose 4…Read more ›

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Here are the questions, with answers and explanations, for the New York State Geometry (Common Core) Regents exam, Parts 3 and 4. There were 3 questions in Part 3, each worth 4 credits. There were 2 questions in Part 4, each worth 6 credits. Partial credit may be earned. All work must be shown. In general, a correct answer without any work is worth 1 credit, unless that answer is given as a choice and an explanation is required. Link to Part 1Link to Part 2 Part 3 32. As shown in the diagram
[…]

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7:13 PM | Tattoo with impossible triangle

Tattoo by jumpsoner
http://im-possible.info/english/art/misc/tattoo/jumpsoner.html
Author - https://instagram.com/jumpsoner/

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matthen:
Connecting all points a varying distance apart along a triangular wave, revealing a variety of smooth curves. Inspired by Henry Moore’s mathematical sculptures. [code]

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5:17 PM | Extracting NBA player movement data

There's no direct download, but there is an API.Tags: API, basketball, Python, sports

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7:01 AM | Live cyber attack map

Norse monitors cyber attacks in real-time. This is their map of what's going on. (All I hear is pew, pew, pew when I watch it.) [via Boing Boing]…Tags: Internet, security

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Each disk is ten times larger than the previous one. If the first disk you see is the size of the palm of your hand, then the second is the size of a coffee table, the third the size of a room. The sixth is the size of Belgium. The eight is the size of the Earth. The 22nd is around the size of the galaxy, and less than 2 minutes into watching, the 27th is the size of the Universe. [code]

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9:50 PM | I’m doing a Reddit AMA

I'm doing a Reddit AMA tomorrow hosted by the DataIsBeautiful subreddit. It'll be at 1:30pm EST on August 27, 2015.Tags: Reddit

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7:39 PM | Impossible wall

Impossible Wall
by Olga Evstigneeva
http://im-possible.info/english/art/pencil/olga-evstigneeva.html

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Here are the questions, with answers and explanations, for the New York State Geometry (Common Core) Regents exam, Part 2. There were 7 questions, each worth 2 credits. Partial credit may be earned for correct work on a problem without a solution, or for a problem with a solution that contains one computational or conceptual error. All work must be shown. In general, a correct answer without any work is worth 1 credit, unless that answer is given as a choice and an explanation is required.
[…]

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7:01 AM | Subway complaints by station

This map of subway complaints in Madrid isn't geographically relevant to me, but the encoding scheme is interesting.Tags: complaints, subway

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matthen:
Connecting all points a varying distance apart along a triangular wave, revealing a variety of smooth curves. Inspired by Henry Moore’s mathematical sculptures. [code]

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8:34 PM | Impossible architecure

Impossible architecture by Socrates Linardos (Varnahir)
http://im-possible.info/english/art/rendering/socrates-linardos.html
Author - http://varnahir.deviantart.com/

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7:45 PM | The birthday candle problem: solution

Recall the birthday candle problem I wrote about in a previous post: A birthday cake has lit candles. At each step you pick a number uniformly at random and blow out candles. If any candles remain lit, the process repeats … Continue reading →

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di diffusione della scienza e rivoluzioni cc @aubreymcfato @CristianCantoro Utilizzare i dati sulle citazioni in Wikipedia per misurare la diffusione dell'open accessScrivevo all'inizio del 2011 per i festeggiamenti del wiki-decennale di una rivoluzione irreversibile. E' stato piuttosto interessante leggere il titolo che technology review ha utilizzato per raccontare dell'ultimo degli articoli dedicati all'enciclopedia libera: Why Wikipedia + Open Access = Revolution.L'idea degli autori, Misha
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Nielsen, F. (2007). Scientific citations in Wikipedia, First Monday, 12 (8) DOI: 10.5210/fm.v12i8.1997

Heather Ford, Shilad Sen, David R. Musicant & Nathaniel Miller (2013). Getting to the source: where does Wikipedia get its information from?, Proceedings of the 9th International Symposium on Open Collaboration, DOI: 10.1145/2491055.2491064

Misha Teplitskiy, Grace Lu & Eamon Duede (2015). Amplifying the Impact of Open Access: Wikipedia and the Diffusion of Science, Wikipedia Workshop at 9th International Conference on Web and Social Media (ICWSM), arXiv: 1506.07608v1

Citation

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After (or before?) @StartsWithABang's balloon animals' post? A couple of week ago Ethan Siegel published a post about ballon animals, so I decide to repost an old piece that I wrote in 2011 for my italian blog: the english version is lost, but it is magically reposted here! Two one-balloon constructions and their associated graphsI recently discovered this interesting site, vihart. In the site there are some interesting paper and today I want to write something about Computational Balloon
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Demaine E.D., Demaine M.L. & Hart V. (2008). Computational balloon twisting: The theory of balloon polyhedra., Proceedings of the 20th Canadian Conference on Computational Geometry (CCCG2008), 139-142.

Bryś K. & Lonc Z. (2009). Polynomial cases of graph decomposition: A complete solution of Holyer's problem, Discrete Mathematics, 309 (6) 1294-1326. DOI: 10.1016/j.disc.2008.01.054

Citation

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Supponiamo di doverci confrontare con un animale, ad esempio un cane o un lupo (o più in generale con un animale, addomesticato o selvaggio). Secondo Konrad Lorenz il comportamento aggressivo di un cane viene influenzato da due stati d'animo differenti: l'ira e la paura.Si può allora provare a prevedere il comportamento del cane in funzione di quale dei due stati domina: nel caso in cui l'animale è dominato da paura o da ira, proporre una previsione è abbastanza semplice; nel caso in cui il […]

Zeeman E.C. (1976). Catastrophe Theory, Scientific American, 234 65-83. DOI: 10.1038/scientificamerican0476-65

Jean Petitot (2013). Complexity and self-organization in Turing, The Legacy of A.M. Turing, (E. Agazzi, ed.), Franco Angeli, Milano, 149-182. arXiv: 1502.05328v1

Citation

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Non prevedevo di scrivere la versione italiana di un post sull'ultima news proveniente dal RHIC, ma mi è stato gentilmente chiesto, e provvedo ben volentieri. Inizio, però, con un piccolo cappello, alla fine del quale saprete che c'è anche un piccolissimo pezzetto (il doppio diminutivo è perché i firmatari del papero su arXiv sono veramente tanti) d'Italia in questa interessante scoperta.Tutto nasce da un post, nel flusso twittero, di Annalisa Arci, in cui racconta, in maniera e con un […]

Belavina A.A., Polyakova A.M., Schwartza A.S. & Tyupkina Y.S. (1975). Pseudoparticle solutions of the Yang-Mills equations, Physics Letters B, 59 (1) 85-87. DOI: 10.1016/0370-2693(75)90163-X

Hooft G.'. (1976). Symmetry Breaking through Bell-Jackiw Anomalies, Physical Review Letters, 37 (8) DOI: 10.1103/PhysRevLett.37.8

Hooft G.'. (1976). Computation of the quantum effects due to a four-dimensional pseudoparticle, Physical Review D, 14 DOI: 10.1103/PhysRevD.14.3432

Fukushima K., Kharzeev D.E. & Warringa H.J. (2008). The Chiral Magnetic Effect, Physics Review D, 78 (7) DOI: 10.1103/PhysRevD.78.074033

Kharzeev D.E. & Yee H.U. (2011). Chiral Magnetic Wave, Physical Review D, 83 DOI: 10.1103/PhysRevD.83.085007

STAR Collaboration (2015). Observation of charge asymmetry dependence of pion elliptic flow and the possible chiral magnetic wave in heavy-ion collisions, arXiv, arXiv: 1504.02175v2

Citation

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A new clue about the #quarkgluonplasma from @RHIC_STAR at @BrookhavenLabWithin the particles that constitute atomic nuclei, protons and neutrons, there are the quarks, the elementary particles with fractional charges, linked to each other thanks to the gluons, bosons that carry the nuclear interaction. Thanks to the gluons it is impossible to observe, at present, free quarks, but it is expected that in the very first stage of the universe, matter was in a state called quark-gluon plasma. Thanks […]

Belavina A.A., Polyakova A.M., Schwartza A.S. & Tyupkina Y.S. (1975). Pseudoparticle solutions of the Yang-Mills equations, Physics Letters B, 59 (1) 85-87. DOI: 10.1016/0370-2693(75)90163-X

Hooft G.'. (1976). Symmetry Breaking through Bell-Jackiw Anomalies, Physical Review Letters, 37 (8) DOI: 10.1103/PhysRevLett.37.8

Hooft G.'. (1976). Computation of the quantum effects due to a four-dimensional pseudoparticle, Physical Review D, 14 DOI: 10.1103/PhysRevD.14.3432

Fukushima K., Kharzeev D.E. & Warringa H.J. (2008). The Chiral Magnetic Effect, Physics Review D, 78 (7) DOI: 10.1103/PhysRevD.78.074033

Kharzeev D.E. & Yee H.U. (2011). Chiral Magnetic Wave, Physical Review D, 83 DOI: 10.1103/PhysRevD.83.085007

STAR Collaboration (2015). Observation of charge asymmetry dependence of pion elliptic flow and the possible chiral magnetic wave in heavy-ion collisions, arXiv: 1504.02175v2

Citation

gaussianos tweeted: @gaussianos

Conjetura sobre combinaciones lineales de enteros y números primos - #AntologíaGaussiana http://t.co/HkQraZpxU7

2015-08-30 11:15:26

MindAfterMath tweeted: @MindAfterMath

Interactive Tutorial of Dijkstra's Algorithm http://t.co/IGesdRNCNA #compsci #datascience #math #stem #mathchat

2015-08-30 10:13:45

ulaulaman tweeted: @ulaulaman

2015-08-30 10:09:02

mluebbecke tweeted: @mluebbecke

RT @ryanjoneil: I hadn't realized you can download Dantzig's Linear Programming and Extensions from @RANDCorporation. Awesome. http://t.co/…

2015-08-30 10:07:15

michiexile tweeted: @michiexile

RT @pozorvlak: LRT: this is exactly why I hate the term "partner" for "main squeeze". No, I am not dating my climbing partner! @yunacaromi …

2015-08-30 10:07:13

rmathematicus tweeted: @rmathematicus

RT @FestivalofIdeas: Mary Shelley was born this day in 1797. Next March we have a special celebration of Shelley and Frankenstein. http://t…

2015-08-30 10:04:36

freakonometrics tweeted: @freakonometrics

"Why the Schengen agreement might be under threat" http://t.co/Ry6chE7IDp http://t.co/yfqcLo0I1n

2015-08-30 10:02:07

rmathematicus tweeted: @rmathematicus

RT @erik_kwakkel: Neat - medical recipe written on pottery fragment (ostrakon, 6th/7th c). Source & more: http://t.co/80Tlha2UgR* http://t.…

2015-08-30 10:01:56

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