@fgrosshans@mathstodon.xyz avatar

fgrosshans

@fgrosshans@mathstodon.xyz

A French researcher in quantum information, expressing his own views.
A few old toots at https://qubit-social.xyz/@fgrosshans

This profile is from a federated server and may be incomplete. Browse more on the original instance.

brab, to random French
@brab@framapiaf.org avatar

C’est rigolo cette mode récente de raccourcir « iakafokon » en « ia »

fgrosshans,
@fgrosshans@mathstodon.xyz avatar

@brab Je connaissais iaka, mais pas ia (pas avec ce sens là en tout cas)

fgrosshans,
@fgrosshans@mathstodon.xyz avatar

@brab J'ai honte de t'avoir lu au 1er degré sans avoir tilté !

rdviii, to random
@rdviii@famichiki.jp avatar

My PhD student Naphan Benchasattabuse passed his thesis proposal today!

fgrosshans,
@fgrosshans@mathstodon.xyz avatar

@rdviii Does this mean he’s Dr Whit3z or not yet ?

gregeganSF, (edited ) to random
@gregeganSF@mathstodon.xyz avatar

In differential geometry, if you have coordinates u and v on a surface, and someone talks about “the u-curves”, would you take this to mean:

(A) the various curves of constant u, and varying v
(B) the various curves of constant v, and varying u?

fgrosshans,
@fgrosshans@mathstodon.xyz avatar

@gregeganSF I obviously am in the minority here, but I'm a physicist, not a mathematician.I don't know if I'm influenced by iso-u curves, which is the case where I've seen this kind of things (e.g. in thermodynamics) or by my native language, French, where contour lines on maps are literally called “level curves” (courbes de niveau)

LegalizeBrain, to random French
@LegalizeBrain@mastodon.zaclys.com avatar

deleted_by_author

    •
    fgrosshans,
    @fgrosshans@mathstodon.xyz avatar

    @LegalizeBrain @jastrow @MatsuBasho @miranda_blue Comment ça Jussieu??? Mais je suis à Jussieu moi!

    brab, to random French
    @brab@framapiaf.org avatar

    Bon, il faut que je vous raconte une micro aventure geek. Divulgâchage : ça parle de comment bien écrire des mails. Donc hier, j’arrive à ma répétition de chorale, et en discutant avant de commencer, on me fait remarquer que j’envoie des mails illisibles. J’avais effectivement envoyé un mail un peu plut tôt (et je le fais régulièrement), refusant d’ouvrir un compte whatsapp pour communiquer. On m’explique que le mail est illisible parce que ma réponse est perdue au milieu d’ancien texte. 1/3

    fgrosshans,
    @fgrosshans@mathstodon.xyz avatar

    @brab Tu me donnes une raison de plus de passer à la méthode "standard non-Geek" de répondre aux mails (Aka répondre au-dessus), mais je ne suis pas sur d'être capable de changer mes vieilles habitudes.

    En y réfléchissant un peu, je vois que cette méthode est courante depuis plus de 25 ans, soit plus longtemps que l'âge de la nétiquette à l'époque où on l'a découvrait tous les deux, et ton exemple montre que les interfaces sont désormais optimisées pour ce cas et pas les mails “nétiquetés”.

    Pour info, on m'a fait remarquer dans un milieu professionnel que la méthode “citation au dessus” permet de reconstituer assez facilement toute la conversation, notamment si quelqu'un arrive en cours de route, ce qui m'a m convaincu de parfois passer dans ce mode

    PS: Je résiste encore à la signature HTML avec logo, mais la pente est savonneuse

    framaka, to TeX French
    @framaka@mastodon.social avatar

    Le saviez-vous ? (moi pas, je découvre, and I think it's beautiful)

    Le système libre de composition de documents ne suit pas une progression croissante dans sa numérotation de version.
    En effet, depuis la version 3, les mises à jour sont indiquées en ajoutant une décimale supplémentaire, s'approchant ainsi toujours un peu plus de π, et donc de la stabilité absolue, à chaque itération.

    La dernière version est la 3.141592653 et elle date de janvier 2021.

    https://fr.wikipedia.org/wiki/TeX

    fgrosshans,
    @fgrosshans@mathstodon.xyz avatar

    @jaco @framaka @Grumpfff Et XeTeX suit la même stratégie, mais avec une autre constante importante : son numéro de version actuel est 0.9999

    gregeganSF, to random
    @gregeganSF@mathstodon.xyz avatar

    Amused to discover that when MacOS’s current Preview app exports an image as a TIFF file, which can use either little-endian or big-endian format for 16 & 32 bit integers, it chooses big-endian. Intel & Apple processors are little-endian; Macs haven’t been BE since Motorola days.

    fgrosshans,
    @fgrosshans@mathstodon.xyz avatar

    @gregeganSF is Motorola pronounced Po-wer-pee-cee ?

    fgrosshans,
    @fgrosshans@mathstodon.xyz avatar

    @gregeganSF It seems PowerMacs were big endian (see e.g. https://news.ycombinator.com/item?id=12838878 ), which make sense if they had a choice, since they were coming from Motorola.

    And then, I guess, it explains the "fossil" endianness of the file system, after more than two decades of big-endian macs. But you're right, we're almost two decades later, but it's difficult to change an old standard

    xgranade, to random
    @xgranade@wandering.shop avatar

    Postquantum crypto is cool, but I wish Signal had asked someone who knew something about quantum computing to review their blog post.

    https://mastodon.world/@signalapp/111092685323940010

    fgrosshans,
    @fgrosshans@mathstodon.xyz avatar

    @xgranade @rdviii @irenes But if you're in the crypto business, you need to be as pessimistic as reasonable, which falls I line with their writing. Furthermore, they add several explicit caveats tom make really clear that nothing is certain in terms of timeline.

    johncarlosbaez, to random
    @johncarlosbaez@mathstodon.xyz avatar

    Besides doing a bunch of useless research on the motion of planets, Kepler did some practical work on the volume of wine barrels. The story is interesting! Roberto Cardil writes:

    "Kepler had several children before his first wife died. In 1613, he married for the second time in a celebration in Linz, Austria. Kepler bought a barrel of wine for the wedding but questioned the method the wine merchant used to measure the volume of the barrel and thus determine the price. In consequence, afterwards Kepler set out both to determine the correct volume of a wine barrel or cask, and to find the proportions that optimize the volume of such a barrel."

    To determine the volume of a wine barrel, Kepler thought of any solid body as made up of thin layers, took the sum of the volumes of these layers, and then took a kind of limit where the thickness of these layers became infinitesimal.

    Otto Toeplitz wrote:

    "Working out finer approximations of various barrel shapes, Kepler consulted Archimedes and discovered that his own method of indivisibles had enabled him to obtain results in a far simpler and more general way than Archimedes, who had been struggling with cumbersome and difficult proofs. What he did not suspect was that Archimedes, too, had found his results by the same method of indivisibles (for his book The Method was lost until 1906!)."

    I guess these "indivisibles" are like "infinitesimals".

    For more, read this:

    Roberto Cardil, Kepler: The Volume of a Wine Barrel, https://www.maa.org/press/periodicals/convergence/kepler-the-volume-of-a-wine-barrel

    The "optimization" problem seems to be maximizing the volume of a barrel while keeping its volume as measured by the wine merchant constant! 😈

    fgrosshans,
    @fgrosshans@mathstodon.xyz avatar

    @johncarlosbaez The indivisibles are indeed precursors to the infinitesimals. A modern name in English of the "method of the indivisibles" is Cavalieri's principle, as explained here https://en.wikipedia.org/wiki/Cavalieri%27s_principle?wprov=sfla1

    PHIL_FISH, to random

    deleted_by_author

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    fgrosshans,
    @fgrosshans@mathstodon.xyz avatar

    @slothrop @toxy @PHIL_FISH
    I don't get how the Audi e-tron (in French, étron = turd) is still sold under this name in France

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