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Here there be dragons | Exploring the subgroups of non-positively curved groups | berstein.wordpress.com Reviews
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Exploring the subgroups of non-positively curved groups
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Non-positively curved groups II – hyperbolic groups | Here there be dragons
https://berstein.wordpress.com/2011/02/13/non-positively-curved-groups-ii-hyperbolic-groups
Here there be dragons. Exploring the subgroups of non-positively curved groups. Non-positively curved groups I – CAT(0) and CAT(-1) groups. Non-positively curved groups III combable, automatic, semi-hyperbolic, and all that →. Non-positively curved groups II – hyperbolic groups. February 13, 2011. In this post and the next we will survey an assortment of intrinsic properties groups can enjoy that bear vestiges of non-positive curvature. We will focus here on. Suppose that a group. Is CAT(0) or CAT(-1).
Quasi-convex subgroups of hyperbolic groups | Here there be dragons
https://berstein.wordpress.com/2011/02/23/quasi-convex-subgroups-of-hyperbolic-groups
Here there be dragons. Exploring the subgroups of non-positively curved groups. Non-positively curved groups IV – quadratic isoperimetric functions. Well behaved subgroups of non-positively curved groups →. Quasi-convex subgroups of hyperbolic groups. February 23, 2011. Our main source for this post is Bridson and Haefliger’s book [BrH]. However, the material has origins in. Alonso, T. Brady, Cooper, Ferlini, Lustig, Mihalik, Shapiro and Short (also ed.),. Ghys and de al Harpe,. Of a geodesic metric space.
berstein | Here there be dragons
https://berstein.wordpress.com/author/berstein
Here there be dragons. Exploring the subgroups of non-positively curved groups. Berstein is the name under which participants in the Berstein Seminar - a mathematics seminar at Cornell - are blogging. Farewell (and what did we miss? July 7, 2011. 8220;I believe in everything until it’s disproved. So I believe in fairies, the myths, dragons.” — John Lennon Our tour of subgroups of non–positively curved groups has reached its end. What did we miss? Cannon-Thurston maps for graphs of groups. July 3, 2011.
Cannon-Thurston maps for graphs of groups | Here there be dragons
https://berstein.wordpress.com/2011/07/03/cannon-thurston-maps-for-graphs-of-groups
Here there be dragons. Exploring the subgroups of non-positively curved groups. Boundaries of Hyperbolic Groups. Farewell (and what did we miss? Cannon-Thurston maps for graphs of groups. July 3, 2011. Recall from our last post. That given an infinite hyperbolic subgroup. Of a hyperbolic group. The extension of the inclusion. Map By the continuity of. If such a map exists it’s unique. Clearly a Cannon-Thurston map exists: equivalent geodesics in. Are mapped to equivalent quasi-geodesics in. Does not exte...
Dehn functions of subgroups of CAT(0) groups | Here there be dragons
https://berstein.wordpress.com/2011/05/19/dehn-functions-of-subgroups-of-cat0-groups-2
Here there be dragons. Exploring the subgroups of non-positively curved groups. Fibre products and the membership problem. A finitely presented non-hyperbolic subgroup of a hyperbolic group →. Dehn functions of subgroups of CAT(0) groups. May 19, 2011. This is a post based on a guest lecture by Pallavi Dani. In this post, we will discuss Dehn functions of subgroups of non-positively curved groups. Let. Be a finitely presented group and let. Be a presentation complex for some presentation of. Is a loop in.
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BI: the Bestvina-Bromberg-Fujiwara construction | Alex Sisto
https://alexsisto.wordpress.com/2013/12/11/bi-the-bestvina-bromberg-fujiwara-construction
Alessandro Sisto's math blog. About me and this blog. Science is too valuable not to be free. An even shorter proof that curve graphs are hyperbolic. BI: the Bestvina-Bromberg-Fujiwara construction. December 11, 2013. This post is about a remarkable construction due to Bestvina-Bromberg-Fujiwara. It has been first used to show that the asymptotic dimension of Mapping Class Groups is finite, and it is quite useful, for example, in this great paper. By Dahmani-Guirardel-Osin (and I used it here. Now, consi...
Just for fun: genus 2 madness in Bonn | Alex Sisto
https://alexsisto.wordpress.com/2012/10/12/just-for-fun-genus-2-madness-in-bonn
Alessandro Sisto's math blog. About me and this blog. Science is too valuable not to be free. BI: Finite decomposition complexity (is preserved by relative hyperbolicity). Tracking of random walks with geodesics →. Just for fun: genus 2 madness in Bonn. October 12, 2012. Real life model of the L-surface, realised by Mark Pedron with the help of Dawid Kielak. Yeah, too much light, I know… Clearer one:. Explanation on the blackboard:. The cone point. Behold the negative curvature! Leave a Reply Cancel reply.
Tracking of random walks with geodesics | Alex Sisto
https://alexsisto.wordpress.com/2013/01/28/tracking-of-random-walks-with-geodesics
Alessandro Sisto's math blog. About me and this blog. Science is too valuable not to be free. Just for fun: genus 2 madness in Bonn. Hyperbolicity of the curve graph: the proof from The Book →. Tracking of random walks with geodesics. January 28, 2013. In this post I’ll tell you about a property of random walks on hyperbolic groups. To make a random walk on a group. Just start from the identity in the Cayley graph, then move to a neighbor with uniform probability and keep going. You have for each. Into t...
BI: Guessing geodesics in hyperbolic spaces | Alex Sisto
https://alexsisto.wordpress.com/2012/07/16/bi-guessing-geodesics-in-hyperbolic-spaces
Alessandro Sisto's math blog. About me and this blog. Science is too valuable not to be free. BI: Teichmüller space, part I. BI: Finite decomposition complexity (is preserved by relative hyperbolicity) →. BI: Guessing geodesics in hyperbolic spaces. July 16, 2012. In this post I’ll discuss a cool lemma due to Brian Bowditch (from this paper. Which is very useful when you want to show that a space is hyperbolic. The most direct way of showing that. Is hyperbolic is trying to figure out how geodesics in.
BI: Finite decomposition complexity (is preserved by relative hyperbolicity) | Alex Sisto
https://alexsisto.wordpress.com/2012/10/03/bi-finite-decomposition-complexity-is-preserved-by-relative-hyperbolicity
Alessandro Sisto's math blog. About me and this blog. Science is too valuable not to be free. BI: Guessing geodesics in hyperbolic spaces. Just for fun: genus 2 madness in Bonn →. BI: Finite decomposition complexity (is preserved by relative hyperbolicity). October 3, 2012. In this post I’ll define finite decomposition complexity (FDC) for you, tell you what it’s good for (Stable Borel Conjecture! And point out that an argument by Osin shows that it is preserved by relative hyperbolicity. Stabilisation p...
Almost all continuous functions are nowhere differentiable | Mathematical Notes
https://chiasme.wordpress.com/2013/05/18/almost-all-continuous-functions-are-nowhere-differentiable
On some mathematical topics I found interesting. Almost all continuous functions are nowhere differentiable. Is a Baire space if a countable intersection of open dense sets is still dense in. Then Baire category theorem consists in:. Baire) A complete metric space is a Baire space. It is a surprising consequence of Baire category theorem that almost all continuous functions are nowhere differentiable in the following sense: Let. Be the set of continuous functions. Endowed with the sup norm. Then, for all.
Free groups acting on the circle | Mathematical Notes
https://chiasme.wordpress.com/2014/02/27/free-groups-acting-on-the-circle
On some mathematical topics I found interesting. Free groups acting on the circle. We present here an unusual application of Baire category theorem between topology, group theory and dynamical systems. Roughly speaking, we prove that almost all pairs of homeomorphisms of the circle are unrelated; in particular, it leads to natural occurrences of free groups. More precisely, if. Denotes the set of orientation-preserving homeomorphisms of the circle, endowed with the distance. The set of pairs. And show th...
armandotk | Coloquio Oleis
https://coloquiooleis.wordpress.com/author/armandotk
Los seguidores de Manolo. Que m* es esto? Problema de la Semana. Mensaje al gremio de la tiza investigadora. Ya que estan para explicar temas dificiles. On Jueves 2, abril, 2009. Quien sabe resolver el te(ore)ma de la SUME? Como se puede utilizar o al menos esbozar una posible resolucion y entender para que deberia servirnos. 9654; View 4 Comments. Suscripción por correo electrónico. Únete a otros 54 seguidores. Análisis Real y Complejo. Construcciones aritméticas parte 2. Notas de Caminatas al azar.
2015 | Coloquio Oleis
https://coloquiooleis.wordpress.com/2015
Los seguidores de Manolo. Que m* es esto? Problema de la Semana. Archive for 2015 Yearly archive page. Construcciones aritméticas parte 2. On Miércoles 5, agosto, 2015. El plan ahora es contar otro tipo de construcción aritmética que da lugar a subgrupos. De co-volumen finito de. Es decir, modulo torsion, variedades de volumen finito modeladas en. Y sobre el final vamos a enunciar la formula para calcular el co-volumen de. En términos de las cuestiones aritméticas que aparecen en su construcción. En pos ...
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Here there be dragons | Exploring the subgroups of non-positively curved groups
Here there be dragons. Exploring the subgroups of non-positively curved groups. Farewell (and what did we miss? July 7, 2011. 8220;I believe in everything until it’s disproved. So I believe in fairies, the myths, dragons.” — John Lennon. Our tour of subgroups of non–positively curved groups has reached its end. What did we miss? Probably lots — apologies to any aggrieved authors out there. Here are a couple of corners of the landscape that we are conscious of having failed to explore. July 3, 2011. Is a ...
Exploring the works of Gilbert Baumslag | The Berstein Seminar, Spring 2015, Cornell Mathematics Department
Exploring the works of Gilbert Baumslag. The Berstein Seminar, Spring 2015, Cornell Mathematics Department. Group Cryptography II: Key Transport Protocols. August 26, 2015. Described one of Gilbert Baumslag’s contributions to group-theoretic cryptography; this, our final post, describes a second. It is based on a talk given at Cornell by Delaram Kahrobaei. On 5/5/2015. Gilbert was Delaram’s PhD advisor. Here they are in 2004 on the day she defended. In our previous post. Is alternative method. A prime.
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Ber Stekelenburg - schilder, beeldhouwer
Exto kunst, kunstenaars, galeries en exposities. Ber Stekelenburg - schilder, beeldhouwer. Ber Stekelenburg, Tilburg 1947. Fotografie s’-Gravenhage, 2 jaar beeldhouwen Rotterdam. Technieken: Schilderingen, acryl/olie op doek en staal. Sculpturen in steen,hout en metaal. Het wordt pas echt schilderen als je de vrijheid hebt gevonden om je door je gevoel te laten leiden, kunst wordt het als je niet binnen de lijntjes blijft en eigenlijk heb ik nooit anders gedaan. Leeuwarder Courant 25 mei 2012. Het is een...
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Mot de passe :. J'ai oublié mon mot de passe. Je me suis mis à la peinture il y a peu, je n'ai jamais pris de cours, voici ce que ça donne sur quelques toiles! Mise à jour :. Bonjour. Merci pour ta visite, c'est. Abonne-toi à mon blog! Si vous voulez savoir où je suis. Comment me trouver, où j'habite. J'ai qu'à vous faire un dessin. Vous n'pouvez pas vous tromper. Quand vous entrez dans la galaxie. Vous prenez tout droit entre Vénus et Mars. Vous évitez Saturne, vous contournez Pluton. Quand vous êtes là.
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Bērnu un jauniešu žūrija. Jaunumi Tavas bibliotēkas plauktos. Pirmdiena, 2015. gada 15. jūnijs. Interesanta, aizraujoša, abas smadzeņu puslodes attīstoša spēle. Divas ar pusi stundas aizskrēja nemanot; pirmie spēlētāji gāja prom ar nožēlu, ka jādodas uz mājām. Paldies Oskaram, ka padalījās ar savu spēli, bet Ivetai paldies, ka iemācīja mums spēlēt! Kopīgot sociālajā tīklā Twitter. Kopīgot sociālajā tīklā Facebook. Piektdiena, 2015. gada 22. maijs. Grāmata par Rundāles novadu. Nāc, brauc, peldi,. Kopīgot ...
