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src=\"https:\/\/i0.wp.com\/xmau.com\/notiziole\/files\/carnevale_matematica.JPG?w=625\" alt=\"[Carnevale della matematica]\" align=\"center\" hspace=\"4\" \/><\/p>\n<p style=\"text-align:right\"><em>\u201ccanta, canta, nero\u201d<\/em><br \/> (dalla <a href=\"http:\/\/keespopinga.blogspot.it\/2014\/05\/poesia-gaussiana-o-dellunicita-della.html\">Poesia gaussiana<\/a>)<\/p>\n<p>Benvenuti all\u2019edizione numero 124 del Carnevale della Matematica! Tema di questo mese \u00e8 &#8220;matematica per le feste&#8221;. Per chi \u00e8 davvero vecchio, il 124 era un modello di auto della Fiat (mio padre ne ha avuta una); per chi \u00e8 amante dell&#8217;aeronautica, l&#8217;Antonov An-124 Ruslan \u00e8 stato il pi\u00f9 grande aereo prodotto in serie. E per i matematici? Beh, \u00e8 un numero nontotiente, perch\u00e9 l&#8217;equazione &phi;(x)=124 non ha soluzioni, ed \u00e8 difettivo (la somma dei suoi divisori propri \u00e8 100); ma \u00e8 anche un <a href=\"https:\/\/it.wikipedia.org\/wiki\/Numero_intoccabile\">numero intoccabile<\/a>, perch\u00e9 non \u00e8 la somma dei divisori propri di alcun numero, e se scritto in base 5 diventa il simpatico 444.<\/p>\n<p>Prima di passare ai contributi del mese, ecco la cellula melodica, proposta come sempre da Dioniso:<br \/>\n<iframe loading=\"lazy\" width=\"640\" height=\"298\" src=\"https:\/\/www.noteflight.com\/embed\/d26e3e071c5f222faab6330091f320352b8ac6a9?scale=1\"><\/iframe><br \/>\nIl fatto che ci sia una terza minore implica forse un Carnevale in tono minore? Spero proprio di no!<\/p>\n<p><strong>Dioniso<\/strong> questo mese si \u00e8 tra l&#8217;altro anche autocelebrato, perch\u00e9 la sua pi\u00e8ce &#8220;I pitagorici&#8221; \u00e8 <a href=\"https:\/\/pitagoraedintorni.blogspot.com\/2018\/11\/i-pitagorici-in-scena-al-dipartimento.html\"><strong>andata in scena al Politecnico di Torino<\/strong><\/a>. E non \u00e8 una festa, forse? <\/p>\n<p>Anche <strong>Annalisa Santi<\/strong> ha voluto restare in tema, con un post dal titolo &#8220;<a href=\"https:\/\/annalisasanti.blogspot.com\/2018\/12\/la-matematica-del-nataletra-libri-e.html\"><strong>La Matematica del Natale&#8230;tra libri e sfere temari<\/strong><\/a>&#8221; (teMari, non teRNari, lo so che voi pensate sempre male). Il post parla di piccoli libri (ovviamente matematici, ma semplici e divertenti) da regalare alla Vigilia di Natale, secondo l&#8217;usanza islandese del &#8220;Jolabokaflod&#8221; o &#8220;Christmas Book Flood&#8221; e di decorazioni per il giorno di Natale: a stella icosaedrica, con digressione sui solidi platonici, e a sfera, derivate dalla tradizione giapponese delle &#8220;palle temari&#8221; ricamate. <\/p>\n<p>Davide Passaro per <strong>Math is in the Air<\/strong> ci propone tanta roba.<br \/>\n<big>&diams;<\/big> Un&#8217;<a href=\"http:\/\/www.mathisintheair.org\/wp\/2018\/12\/intervista-ad-alessandro-giuliani-lasciatevi-guidare-dal-piacere-e-dalla-curiosita-per-lo-studio-della-matematica-e-della-fisica\/\"><strong>intervista ad Alessandro Giuliani<\/strong><\/a>, professore di Fisica Matematica all&#8217;universit\u00e0 di Roma Tre. La frase &#8220;Lasciatevi guidare dal piacere e dalla curiosit\u00e0 per lo studio della matematica e della fisica&#8221; scelta come sottotitolo dell&#8217;intervista fa gi\u00e0 intuire che l&#8217;intervista offre spunti interessanti. Nell&#8217;intervista si parla di meccanica statistica, modello del grafene e della formula di Osanger per la magnetizzazione spontanea.<br \/>\n<big>&diams;<\/big> Un contributo esterno di Giordano Col\u00f2 che affronta l&#8217;affascinante tema della <a href=\"http:\/\/www.mathisintheair.org\/wp\/2018\/12\/stringhe-che-vibrano-e-simmetria-speculare-parte-1\/\"><strong>teoria delle stringhe<\/strong><\/a>, intitolato &#8220;Stringhe che vibrano e simmetria speculare&#8221;. In questo articolo, primo di una serie, si parla dello spazio di Calabi-Yau e della congettura SYZ.<br \/>\n<big>&diams;<\/big> Segue un affascinante articolo di Maria Mannone del titolo: <a href=\"http:\/\/www.mathisintheair.org\/wp\/2018\/11\/dante-gaudi-dali-un-dialogo-fra-geometria-natura-e-fede\/\"><strong>&#8220;Dante Gaud\u00ec, Dal\u00ec: un dialogo fra geometria, natura e fede&#8221;<\/strong><\/a>.<br \/>\n<big>&diams;<\/big> La seconda parte di una serie scritta da Valerio Novelli sul <a href=\"http:\/\/www.mathisintheair.org\/wp\/2018\/11\/il-modello-di-ising-volume-ii\/\"><strong>modello di Ising<\/strong><\/a> (la prima parte, se l&#8217;avete persa, \u00e8 <a href=\"http:\/\/www.mathisintheair.org\/wp\/2017\/12\/il-modello-di-ising-an-hot-and-cold-start\/\"><strong>qui<\/strong><\/a>)<br \/>\n<big>&diams;<\/big> Infine Davide <a href=\"http:\/\/www.mathisintheair.org\/wp\/2018\/11\/rivista-didattica-della-matematica-articolo-sui-risultati-dellindagine-io-e-la-matematica\/\"><strong>segnala la pubblicazione<\/strong><\/a> di un articolo sulla rivista &#8220;Didattica della Matematica&#8221; frutto dell&#8217;indagine realizzata da &#8220;Math is in the Air&#8221; in collaborazione con i proff. Pietro Di Martino e Rosetta Zan della facolt\u00e0 di matematica dell&#8217;Universit\u00e0 di Pisa.<\/p>\n<p><strong>Gianluigi Filippelli<\/strong> questo mese si \u00e8 lanciato! Su Dropsea potrete leggere<br \/>\n<big>&diams;<\/big> In <a href=\"https:\/\/dropseaofulaula.blogspot.com\/2018\/12\/arte-matematica-piero-della-francesca.html\"><strong>L&#8217;arte matematica di Piero della Francesca<\/strong><\/a> racconta come Piero della Francesca non fosse solo un grande pittore, ma anche un valente matematico.<br \/>\n<big>&diams;<\/big> Per la serie dei Rompicapi di Alice, un rompicapo proposto da Martin Gardner: <a href=\"https:\/\/dropseaofulaula.blogspot.com\/2018\/12\/i-rompicapi-di-alice-cubi-cubi-sempre.html\"><strong>Cubi, cubi, sempre cubi<\/strong><\/a> &#8220;\u00c8 possibile tagliare un cubo in un numero infinito di altri cubi pi\u00f9 piccoli nessuno dei quali identico a un altro?&#8221;, rompicapo a cui segue un brevissimo esame della sfida logica tra Achille e la tartaruga. Il tutto nel segno della regressione infinita.<br \/>\n<big>&diams;<\/big> Pi\u00f9 legato alla fisica, <a href=\"https:\/\/dropseaofulaula.blogspot.com\/2018\/12\/misurare-la-velocita-della-luce-in.html\"><strong>Misurare la velocit\u00e0 della luce in classe<\/strong><\/a>. Il titolo \u00e8 gi\u00e0 di per s\u00e9 esplicativo. Attenzione: ci sono formule!<br \/>\nPassando al Caff\u00e9 del Cappellaio Matto:<br \/>\n<big>&diams;<\/big> <a href=\"https:\/\/www.lospaziobianco.it\/alcaffedelcappellaiomatto\/pico-e-paperoga-profeti-del-caos\/\"><strong>Pico e Paperoga profeti del caos<\/strong><\/a>. Partendo da una storia breve uscita su Topolino #3288 con Paperino, Paperoga e Pico de Paperis, un articolo sulla teoria del caos e i biliardi.<\/p>\n<p><strong>Roberto Zanasi<\/strong> presenta invece l&#8217;ultima parte di <a href=\"http:\/\/proooof.blogspot.com\/2018\/12\/minacce-aliene-parte-4.html\"><strong>Minacce Aliene<\/strong><\/a>, con la funzione di Ackermann usata nel computo dei numeri di Ramsey. Attenzione: ci sono numeri <i>davvero<\/i> grandi!<\/p>\n<p>Da <strong>MaddMaths!<\/strong> la solita messe di contributi.<br \/>\n<big>&diams;<\/big> <a href=\"http:\/\/maddmaths.simai.eu\/divulgazione\/focus\/dopo-atiyah\/\"><strong>Dopo Atiyah: a che punto siamo con la congettura di Riemann?<\/strong><\/a> &#8211; Luned\u00ed 24 settembre 2018, Sir Michael Atiyah, in una conferenza tenuta nell\u2019ambito dell\u2019\u201cHeildeberg Laureate Forum,\u201d ha annunciato la dimostrazione della Congettura di Riemann. La notizia ha destato sensazione anche al di fuori della comunit\u00e0 matematica: approfittiamo di questa occasione per ricordare di che cosa si tratta e anche per descrivere con qualche dettaglio il processo di \u201cvalidazione\u201d della ricerca in matematica. Un articolo di Alberto Saracco &amp; Alessandro Zaccagnini.<br \/>\n<big>&diams;<\/big> <a href=\"http:\/\/maddmaths.simai.eu\/comunicare\/comunicati-stampa\/limportanza-della-formazione-iniziale-degli-insegnanti-la-necessita-assoluta-di-non-tornare-indietro-di-30-anni\/\"><strong>L\u2019importanza della formazione iniziale degli insegnanti: la necessit\u00e0 assoluta di non tornare indietro di 30 anni<\/strong><\/a> &#8211;  Comunicato della CIIM sulla discussione parlamentare relativa alla revisione del sistema di formazione e reclutamento dei docenti di scuola secondaria (modifiche al D.L. n.59 del 13 aprile 2017). Apparso anche sulla pagina della CIIM, questo comunicato \u00e8 stato condiviso con tutti i componenti delle commissioni permanenti per Istruzione pubblica, beni culturali, ricerca scientifica, spettacolo e sport del Senato e e per Cultura, Scienza e Istruzione della Camera.<br \/>\n<big>&diams;<\/big> <a href=\"http:\/\/maddmaths.simai.eu\/comunicare\/rassegna-stampa\/radio\/caro-vaime\/\"><strong>Caro Vaime, ci dispiace davvero, non sa cosa si \u00e8 perso!<\/strong><\/a> &#8211; Enrico Vaime, popolare autore e conduttore radiofonico e televisivo, ha dedicato alla Matematica il suo editoriale per la trasmissione Black Out su Rai Radio 2 di Sabato 24 Novembre 2018. I membri del comitato editoriale di MaddMaths! hanno ascoltato questo intervento che ci racconta una matematica che non riconosciamo, molto diversa da quella che pratichiamo e insegniamo. E francamente c\u2019\u00e8 dispiaciuto che per lui la nostra materia preferita fosse cos\u00ec triste e poco creativa. Abbiamo provato a rispondergli con due testi, uno di tono giocoso di Sandra Lucente, una specie di \u201cinversione\u201d creativa dei temi ascoltati nell\u2019editoriale, e l\u2019altro di Pietro Di Martino, sul rapporto che le persone instaurano con la matematica.<br \/>\n<big>&diams;<\/big> <a href=\"http:\/\/maddmaths.simai.eu\/divulgazione\/langolo-arguto\/superpermutazioni\/\"><strong>Superpermutazioni: che nome dare a un Teorema?<\/strong><\/a> &#8211;  Recentemente molti siti di divulgazione scientifica hanno riportato la soluzione di un problema di combinatoria: la stima del limite della lunghezza di una superpermutazione minima di n elementi. Molto probabilmente il problema non avrebbe attratto tanta attenzione se non fosse per la curiosit\u00e0 offerta dall\u2019identit\u00e0 degli scopritori: un anonimo in una lista di discussione e lo scrittore di fantascienza Greg Egan. Ce ne parla Nicola Ciccoli, che riflette sulle nuove forme di comunicazione dei risultati.<br \/>\n<big>&diams;<\/big> <a href=\"http:\/\/maddmaths.simai.eu\/divulgazione\/recensioni\/tutto-calcolato-recensione\/\"><strong>\u00c8 tutto calcolato \u2014 recensione del libro di Lorenzo Baglioni<\/strong><\/a> &#8211; Lorenzo Baglioni, classe 1986, grossetano di nascita, ma fiorentino d\u2019adozione, gi\u00e0 da tempo noto al popolo del web, ha sfondato con il grande pubblico grazie alla partecipazione al Festival di Sanremo 2018 con la canzone didattica Il congiuntivo. Attore, cantante, comico, youtuber, ma anche matematico. Ora ha scritto un libro e Alberto Saracco ce lo racconta.<br \/>\n<big>&diams;<\/big> <a href=\"http:\/\/maddmaths.simai.eu\/persone\/vita-da-matematico-persone\/john-urschel\/\"><strong>John Urschel \u00e8 un professionista<\/strong><\/a> &#8211; In Italia \u00e8 praticamente sconosciuto, ma la sua storia \u00e8 veramente notevole. Stiamo parlando di John Urschel, 27 anni, matematico americano di origini canadesi, che ha giocato da professionista nella National Football League. Di seguito trovate l\u2019intervista raccolta per il sito Hmm Daily da Jordan Ellenberg, professore di matematica presso l\u2019Universit\u00e0 di Winsconsin-Madison, qui nella traduzione in italiano a cura di Roberto Natalini.<\/p>\n<p>I <strong>Rudi Mat(h)ematici<\/strong> sono in ritardo per il numero di dicembre della rivista, ma hanno comunque pubblicato varie cose, riassunte telegraficamnte qui sotto:<br \/>\n<big>&diams;<\/big> <a href=\"http:\/\/rudimatematici-lescienze.blogautore.espresso.repubblica.it\/2018\/11\/15\/dalla-triremi-allautomobile\/\"><strong>Dalla triremi all\u2019automobile<\/strong><\/a> \u00e8 uno strano Paraphernalia che parte da  Antikythera per arrivare fino alla Fiat Dedra (che non esiste, perch\u00e9 era una Lancia).<br \/>\n<big>&diams;<\/big> <a href=\"http:\/\/rudimatematici-lescienze.blogautore.espresso.repubblica.it\/2018\/11\/22\/l%e2%80%99enigma-della-grande-disputa-tra-il-frate-e-l%e2%80%99apparitore\/\"><strong>L\u2019enigma del frate e dell\u2019apparitore<\/strong><\/a> continua la tradizione degli indovinelli di Canterbury.<br \/>\n<big>&diams;<\/big> <a href=\"http:\/\/rudimatematici-lescienze.blogautore.espresso.repubblica.it\/2018\/11\/30\/il-problema-di-novembre-603-che-la-scopa-sia-con-voi\/\"><strong>Che la scopa sia con voi<\/strong><\/a> \u00e8 il solito post risolutivo e istituzionale.<br \/>\n<big>&diams;<\/big> Infine un quick&#038;dirty che tira in ballo Paperino: <a href=\"http:\/\/rudimatematici-lescienze.blogautore.espresso.repubblica.it\/2018\/12\/07\/quick-dirty-operazioni-paperinesche\"><strong>Operazioni paperinesche<\/strong><\/a>.<\/p>\n<p>Che cosa ho scritto io, infine?<br \/>\nSul Post ho due interventi. <a href=\"https:\/\/www.ilpost.it\/mauriziocodogno\/2018\/11\/15\/ah-la-discalculia\/\"><strong>Ah, la discalculia!<\/strong><\/a> non parla in realt\u00e0 della discalculia ma dei due errori di matematica fatti dal titolista del Corriere; <a href=\"https:\/\/www.ilpost.it\/mauriziocodogno\/2018\/12\/03\/enrico-vaime-e-la-sua-matematica\/\"><strong>Enrico Vaime e la \u201csua\u201d matematica&#8221;<\/strong><\/a> parla del brano di Enrico Vaime trattato anche da MaddMaths! sotto una luce un po&#8217; diversa.<br \/>\nQui sulle Notiziole, i quizzini della domenica sono stati <a href=\"http:\/\/xmau.com\/wp\/notiziole\/2018\/11\/18\/quizzino-della-domenica-cartello\/\"><strong>Cartello<\/strong><\/a> (poco matematico, ve lo dico subito), <a href=\"http:\/\/xmau.com\/wp\/notiziole\/2018\/11\/25\/quizzino-della-domenica-dimezzare\/\"><strong>Dimezzare<\/strong><\/a>, <a href=\"http:\/\/xmau.com\/wp\/notiziole\/2018\/12\/02\/quizzino-della-domenica-stella-a-otto-punte\/\"><strong>Stella a otto punte<\/strong><\/a> e <a href=\"http:\/\/xmau.com\/wp\/notiziole\/2018\/12\/09\/quizzino-della-domenica-successione\/\"><strong>Successione<\/strong><\/a>. Per le recensioni, <a href=\"http:\/\/xmau.com\/wp\/notiziole\/2018\/11\/17\/_il-tempo-libro\/\"><strong>Il tempo<\/strong><\/a> di Stefan Klein, troppo spezzettato per i miei gusti; <a href=\"http:\/\/xmau.com\/wp\/notiziole\/2018\/11\/24\/_infinito_-libro\/\"><strong>Infinito<\/strong><\/a> di Umberto Bottazzini, forse pi\u00f9 filosofico ma con spunti molto interessanti, e <a href=\"https:\/\/xmau.com\/wp\/notiziole\/2018\/12\/08\/_furor-mathematicus_-libro\/\"><strong>Furor Mathematicus<\/strong><\/a> di Leonardo Sinisgalli, dove di matematica c&#8217;\u00e8 solo una piccola parte ma il punto di vista \u00e8 piuttosto peculiare.<\/p>\n<p>Buona lettura e buone feste a tutti! L&#8217;anno prossimo troverete il Carnevale, sempre il 14 del mese, da <a href=\"http:\/\/www.mathisintheair.org\/\">Math is in the Air<\/a> con tema &#8220;Matematica e libert\u00e0&#8221;.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u201ccanta, canta, nero\u201d (dalla Poesia gaussiana) Benvenuti all\u2019edizione numero 124 del Carnevale della Matematica! Tema di questo mese \u00e8 &#8220;matematica per le feste&#8221;. Per chi \u00e8 davvero vecchio, il 124 era un modello di auto della Fiat (mio padre ne ha avuta una); per chi \u00e8 amante dell&#8217;aeronautica, l&#8217;Antonov An-124 Ruslan \u00e8 stato il pi\u00f9 [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"","_lmt_disable":"","jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"activitypub_content_warning":"","activitypub_content_visibility":"","activitypub_max_image_attachments":3,"activitypub_interaction_policy_quote":"anyone","activitypub_status":"","footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[214],"tags":[],"class_list":["post-17807","post","type-post","status-publish","format-standard","hentry","category-matematica_light"],"modified_by":".mau.","jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p6hcSh-4Dd","jetpack-related-posts":[{"id":31547,"url":"https:\/\/xmau.com\/wp\/notiziole\/2025\/08\/27\/numeri-perfetti-allo-specchio\/","url_meta":{"origin":17807,"position":0},"title":"Numeri &#8220;perfetti allo specchio&#8221;","author":".mau.","date":"2025-08-27","format":false,"excerpt":"Una delle propriet\u00e0 pi\u00f9 inutili dei numeri, mi sa...","rel":"","context":"In &quot;mate-light-2025&quot;","block_context":{"text":"mate-light-2025","link":"https:\/\/xmau.com\/wp\/notiziole\/category\/matematica_light\/matelight-2025\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":21395,"url":"https:\/\/xmau.com\/wp\/notiziole\/2020\/12\/04\/statistiche-del-sito-per-novembre-2020\/","url_meta":{"origin":17807,"position":1},"title":"Statistiche del sito per novembre 2020","author":".mau.","date":"2020-12-04","format":false,"excerpt":"calma piatta","rel":"","context":"In &quot;admin&quot;","block_context":{"text":"admin","link":"https:\/\/xmau.com\/wp\/notiziole\/category\/admin\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":21543,"url":"https:\/\/xmau.com\/wp\/notiziole\/2021\/01\/01\/statistiche-del-sito-per-dicembre-2020\/","url_meta":{"origin":17807,"position":2},"title":"Statistiche del sito per dicembre 2020","author":".mau.","date":"2021-01-01","format":false,"excerpt":"Termino la serie delle statistiche con quelle di dicembre, mese come al solito fiacco. I visitatori unici sono stati 18146 per 35358 visite; le pagine accedute sono state 91560, con 236833 hit. Quattro giorni hanno visto meno di 1000 visite: domenica 20 e il triduo 24-25-26. La top 5 \u00e8\u2026","rel":"","context":"In &quot;admin&quot;","block_context":{"text":"admin","link":"https:\/\/xmau.com\/wp\/notiziole\/category\/admin\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":20409,"url":"https:\/\/xmau.com\/wp\/notiziole\/2020\/05\/14\/carnevale-della-matematica-140\/","url_meta":{"origin":17807,"position":3},"title":"Carnevale della matematica #140","author":".mau.","date":"2020-05-14","format":false,"excerpt":"\u201ccanta, canta melodioso tra i cespugli\u201d (Poesia gaussiana) Benvenuti all'edizione numero 140 del Carnevale della Matematica! Il tema \"giochi\" non sar\u00e0 il massimo, ma la morte di John Conway me l'ha fatto venire in mente. E poi sapete bene che io amo i giochi! Che dire delle propriet\u00e0 matematiche del\u2026","rel":"","context":"In &quot;matematica_light&quot;","block_context":{"text":"matematica_light","link":"https:\/\/xmau.com\/wp\/notiziole\/category\/matematica_light\/"},"img":{"alt_text":"logo-carnevale_matematica","src":"https:\/\/i0.wp.com\/xmau.com\/wp\/ilpost\/wp-content\/uploads\/sites\/4\/2016\/06\/logo-carnevale_matematica.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":22329,"url":"https:\/\/xmau.com\/wp\/notiziole\/2021\/06\/20\/quizzino-della-domenica-forza-1000\/","url_meta":{"origin":17807,"position":4},"title":"Quizzino della domenica: Forza 1000","author":".mau.","date":"2021-06-20","format":false,"excerpt":"Ci sono 924 modi diversi di scegliere sei numeri tra i dodici di questo rettangolo. Per\u00f2 per uno solo di essi la somma dei sei numeri \u00e8 1000. Riuscite a trovare quali sono i sei numeri? 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