Seventh Linkfest
I’m extremely happy to present the seventh Linkfest for your pleasure, fun and profit. Thousands of men meditated for thousands of years to generate the pure knowledge and wisdom contained in these links. I hope they will revolutionize your life. I hope thirty years from now you will gaze down from the heights of power and success and remember the Seventh Linkfest which gave you the tools to conquer the world.
The previous linkfest was Linkfest 6.
Technical
Scott Aaronson: Projects aplenty (a huge list of project suggestions for grad students in computer science), Tools for the modern complexity theorist
Ngô Quốc Anh: Norm of traceless Ricci tensor, Variations of the determinant, The entropy logarithmic energy inequality
John Armstrong: Integral curves and local flows, The Maximal Flow of a Vector Field, Vector fields on compact manifolds are complete, Maps Intertwining Vector Fields, The Lie algebra of a Lie group, General linear groups are Lie groups, The Lie algebra of a general linear group
Jeremy Avigad, Edward Dean, and Jason Rute: Algorithmic randomness, reverse mathematics, and the dominated convergence theorem (arXiv)
John Baez: Christopher Walker on Hall Algebras
Andrej Bauer: Stone duality for skew boolean algebras with intersections
Ken Baker: Rational Tangle Fibration
Alexandre Borovik quoting Jeff Sarnat: More on abstract thinking and computer science
James Freitag: Indecomposability for differential algebraic groups, Completeness in Partial Differential Fields (both arXiv)
William Gasarch: RaTLoCC (or: on a conference about Ramsey theory)
Hilbertthm90: Multiplication is repeated addition
Jesse Johnson: A funny thing about circular thin position
Tanya Khovanova: Freedom and Diamonds
Carlos Matheus: Billiards, Flat Surfaces and Dynamics on Moduli Spaces at Oberwolfach 2011, Non-uniformly hyperbolic horseshoes have Hausdorff dimension < 2
Akhil Mathew: The nPOV, sheathes, and derived categories, Verdier duality, Soft sheaves
Arnold Miller: Uniquely Universal Sets (arXiv)
Antonio Montalban: A fixed point for the jump operator on structures (arXiv)
Kenneth Regan: How powerful are random strings?, Types of Math Papers
Dan Piponi: Simulating visual artifacts with Fourier optics
Gordon Royle: An elusive conjecture (that a finite projective plane with a point-transitive automorphism group must be Desarguesian)
Hans Schoutens: O-minimalism (arXiv)
Shreevatsa: How does Tupper’s self-referential formula work?
Terence Tao: The Cotlar-Stein Lemma, Locally compact groups with faithful finite-dimensional representations, van Dantzig’s Theorem, The Furstenberg multiple recurrence theorem and finite extensions
Peter Woit: Math and Physics, Summer 2011 (specifically: about a conference thereon)
Qiaochu Yuan: Euler characteristic as homotopy cardinality
Non-Technical
Avoision: Finding Time to Write
Michel Bauwens: The Shanzai electric car revolution in China, Software + data as business models, The amazing bike-sharing program in Hangzhou, China
Matthew Belinkie: Clichemaggedon 3D: The Winners
Alexandre Borovik: An “average word problem” in the Khan Academy, Is the world mathematical?, Assessment by linear ordering, More on Raspberry Pi, First appearance of algebraic notation
Peter Casazza: A Mathematician’s Survival Guide (PDF)
Sonic Charmer: Buster Posey (or: why baseball shouldn’t be a contact sport)
Diana Davis: Submitting a (math) paper online
Cory Doctorow: Google’s YouTube policy for Android users is copyright extremism
Lance Fortnow: 75 years of computer science
Simon Grey: A decent half-measure (or: on a copyright law proposal), Good news from YouTube (specifically, availability of more Creative Commons content for developers to use)
Nathan Eady: Firefox: Why I Refuse to Upgrade
Henrir: How the next generation (of video game consoles) should shape up, E3 Impressions: The WiiU, Asymmetric Multiplayer
JSE: What experimental math taught me about my intuition
Brian Katz: Technology Supporting Innovative Pedagogy
Tanya Khovanova: A nerd’s way to walk up the stairs, Recent Geeky Jokes
Izabella Laba: PIMS collaborative research groups (and why Izabella doesn’t like them)
Mark Lee: The Prestige Factor for Actors
Michael Lugo: The most well-read cities in the United States
Matt Novak: A Trip through Space for Boys and Girls (1954)
Christopher Olah: Alien Mathematics, Numbers, and Polynomial Centric Societies
Orchid64: Will miss #327: Cat cafes
Alex Papadimoulis: Divide by Zero (or: a terrible implementation thereof in PHP)
The Physicist: Is it possible to destroy a black hole?, Q: How close is Jupiter to being a star? What would happen to us if it were?
Remy Porter: Design for the Future, Twenty-Four Bits per Intern
Derek Sivers: Any Questions? (or: on learning and on conscious vs. unconscious competence), I moved to Singapore
Derek Smith: The Bore Method, or Challenging Students
Moor Xu: Dreams (or: when math enters your dreams)
Pictures and Photography
Avoision: Tiny signs in Logan Square
Ruben Berenguel: Road Trip Through Iceland: Day 9 – Goðafoss and Hólar
Izabella Laba: Spring Photos
Loco: Best Shots of the Week
Telefunker: Filature EDP (abandoned spinning mill in Belgium)