Ninth Linkfest
Welcome to the Ninth Linkfest. This time around, I am experimenting with splitting the “Technical” links up into two parts: “Technical But Followable”, and “Technical (Harder to Follow)”. This is of course, pretty subjective. Due to my own focus, stuff about logic is obviously easier for me to follow, while stuff about (say) Lie groups is harder for me to follow and hence more likely to end up in the latter grouping. But hopefully my bias shouldn’t be too different from most peoples’. After all, it’s an undisputed fact that mathematical logic is the most beautiful field of math 
The previous linkfest is here: Eighth Linkfest
Technical (But Followable)
Scott Aaronson: What Alan Turing did for his PhD
Michael O’Connor: A Logical Interpretation of some bits of Topology
Emmanuel Kowalski: Cartain’s “Sur certains cycles arithmétiques”
Tom Leinster: Hadwiger’s Theorem
Richard Lipton: NP-Intermediate?
The Physicist: What does a measurement in quantum mechanics do?
K.W. Regan: Name That Graph, Triple Century Post (or: How does continuous math impact discrete complexity?)
Terence Tao: Polynomial bounds via nonstandard analysis, On the number of solutions to 4/p=1/n1+1/n2+1/n3
Technical (Harder to Follow)
John Armstrong: Distributions, Integral Submanifolds, The Hopf Fibration, Tensor Bundles
John Bamberg: New locally 9-arc-transitive graphs!
Julien Cassaigne, James D. Currie, Luke Schaeffer, and Jeffrey Shallit: Avoiding Three Consecutive Blocks of the Same Size and Same Sum (arXiv)
Tanya Khovanova: Complexity of Periodic Strings
Steven Sam: Do the rank k matrices form an affine variety?
Sigfpe: An elementary way to approach Fourier transforms
David Speyer: Why graded bi-algebras have antipodes
Terence Tao: Two small facts about Lie groups
Qiaochu Yuan: The Representation Theory of SU(2)
Non-Technical
Gavin Andreson: Bitcoins worth more than the computer they are stored on
Avoision: The clock in the mountains
Diana Barnes-Brown: TJ Maxx flunks old school
Michel Bauwens: The Alliance to Develop Power in western Massachusetts, The emergence of a movement against corporate personhood
Blogstrapping: An Open Letter To Barnes & Noble About Text Files
BlueShoe: Let’s Enjoy Japanese: “Before You Know It”
Jelle Bruinsma: The Battle for Syntagma
CTK: What is it about math language that makes it confusing?
Delta: On Tau (on the movement to replace pi with 2*pi)
James Feudo: Will Facebook still be around in five years?
Lance Fortnow: Quantum TiVo
Michael Frank: We the Processors (or: on using Bitcoin algorithms to run elections)
The Futurist: The End of Petrotyranny
Bradley Garrett: An open letter to the British Transport Police
Andrew Gelman: Different goals, different looks: Infovis and the Chris Rock effect
Simon Grey: I was right (about criminals disguising as police), Happiness, A reasonable proposal (to raise or eliminate speed limits)
Rhys Jones: A new approach to printing metals
Khatzumoto: Top 10 Great Japanese Movies from 1998 to 2008
Cap Khoury: Happy Tau Day 2011!, Tau Day Leftovers
Orchid64: Won’t Miss #335: kisoku wa kisoku da (“Rules are Rules”)
Melanie Laffin: “The Pigeonhole Principle” (or: On Academic Over-Specialization)
Alex Papadimoulis: Trans-Atlantic Time Trap, Supported Image Formats, The Dreaded Zebra, and The Un-Fix
Sudip Paul: My First Teaching Experience
Remy Porter: The Key to a Good Schema (or: yet another database horror story)
Sam Shah: Taught Curriculum vs. Learned Curriculum
Peter Smith: Thank Heavens that’s over… (a retiring philosopher’s thoughts while clearing out his desk)
SonicCharmer: The “Cars” Franchise is This Generation’s Star Wars, I am not DSK, Against (Movie) Remakes
Ben Webster: Is having a pay copy-editing service a new low for Elsevier?
Peter Woit: Higher Speculations (a look back at “vortex theory”, the 19th century equivalent of string theory)
Art, Photography, etc.
Avoision: Crazy Hail Storm in Logan Square
Telefunker: Magran (an abandoned grain mill in Belgium), Fort Steendorp (Belgium)
Freddie Wong: Man vs. Katamari (YouTube)
Nick Yates: Buffalo!