# 17 de Febrero, 2012

### Publicado el 17 de Febrero, 2012, 11:49

 Más enlaces, un "potpourri" de temas que me interesan: Los centros del triángulo: el punto de Nagelhttp://gaussianos.com/los-centros-del-triangulo-el-punto-de-nagel/ Basic logic — connectives — AND and ORhttp://gowers.wordpress.com/2011/09/25/basic-logic-connectives-and-and-or/ Normal subgroups and quotient groupshttp://gowers.wordpress.com/2011/11/20/normal-subgroups-and-quotient-groups/ The structure of approximate groupshttp://terrytao.wordpress.com/2011/10/24/the-structure-of-approximate-groups/ Proving the fundamental theorem of arithmetichttp://gowers.wordpress.com/2011/11/18/proving-the-fundamental-theorem-of-arithmetic/ Adrian Paenza habla sobre su vision del paishttp://artepolitica.com/videos/adrian-paenza-habla-sobre-su-vision-del-pais/ Karatsuba algorithmhttp://en.wikipedia.org/wiki/Karatsuba_algorithm#History Ishango, 22000 and 50 years later: the cradle of mathematics?http://etopia.sintlucas.be/3.14/Ishango_meeting/Ishango_meeting.htmhttp://ishango.naturalsciences.be/ Ishango bonehttp://en.wikipedia.org/wiki/Ishango_boneThe Ishango bone is a bone tool, dated to the Upper Paleolithic era. It is a dark brown length of bone, the fibula of a baboon,[1] with a sharp piece of quartz affixed to one end, perhaps for engraving. It was first thought to be a tally stick, as it has a series of what has been interpreted as tally marks carved in three columns running the length of the tool, but some scientists have suggested that the groupings of notches indicate a mathematical understanding that goes beyond counting. It has also been suggested that the scratches might have been to create a better grip on the handle or for some other non-mathematical reason Most striking applications of category theory?http://mathoverflow.net/questions/19325/most-striking-applications-of-category-theory Coffin problems (los problemas judíos)http://insomniablog.com.ar/?p=1342 "Coffins"http://www.tanyakhovanova.com/coffins.htmlHere is a collection of difficult math problems with elegant solutions that possess a unique history. Fermat Pseudoprimehttp://mathworld.wolfram.com/FermatPseudoprime.html Topology without Tearshttp://uob-community.ballarat.edu.au/~smorris/topology.htm Four-momentumhttp://en.wikipedia.org/wiki/Four-momentumIn special relativity, four-momentum is the generalization of the classical three-dimensional momentum to four-dimensional spacetime. An Introduction to the Fascinating Patterns of Visual Mathhttp://www.miqel.com/fractals_math_patterns/visual_math_varieties.html ¿Cómo, esto también es matemática?http://cms.dm.uba.ar/material/paenza/libro6 Geometría ¿sanadora? con poliedroshttp://eliatron.blogspot.com/2011/11/geometria-sanadora-con-poliedros.html Best statistics question everhttp://flowingdata.com/2011/10/28/best-statistics-question-ever/ Prequantum Physics in a Cohesive ∞-Toposhttp://golem.ph.utexas.edu/category/2011/10/prequantum_physics_in_a_cohesi.html Towards the Mathematics of Quantum Field Theoryhttp://golem.ph.utexas.edu/category/2011/06/towards_the_mathematics_of_qua.html Mis enlaceshttp://delicious.com/ajlopez/mathematics Angel "Java" Lopezhttp://www.ajlopez.comhttp://twitter.com/ajlopez