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Raphaël Pinson
Works at Camptocamp SA
Attended ENSMA
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Lugano Lake
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So Lenovo has decided to let go of their standard, simple round charging plugs...
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Vous avez des airs :)
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The Opus codec becomes an IETF standard [LWN.net] - http://ae7.st/s/2q
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Explanations of all the strange Debian package names you always wondered about: http://wiki.debian.org/WhyTheName
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augeasproviders 1.1.0 is out with a new Apache directive provider, PAM config entry provider, an augeasproviders::instances class, a performance boost on Puppet 3.4+ and more!

Thanks to +Raphaël Pinson, +Greg Swift and +Trey Dockendorf!

Check http://augeasproviders.com/documentation/changelog.html and download it from the Puppet Forge.
augeasproviders. Alternative Augeas-based providers for Puppet. Latest version: 1.1.0 (changelog). Download TAR Ball · View On GitHub · View On Forge · Home · Setup · Providers · Examples · Classes · Other docs. Changelog. Historic versions of augeasproviders can be downloaded from Puppet Forge.
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+Vladimir Bulatov does it again!  At each moment, this movie shows you a tiling of the hyperbolic plane by pentagons, four meeting at each corner, mapped onto a disc with four slits cut out.  This mapping is conformal, meaning that it preserves angles.  As time passes, the hyperbolic plane rotates and we see this crazy movie.

For a more detailed explanation, with tons of great pictures, go here: http://bulatov.org/math/1001/

Here's the short version: there's a way to measure distances on a disk that makes it into a model of the hyperbolic plane.  There are actually a number of ways, but Bulatov - and Escher - use the Poincare disk model, because in this model straight lines look like portions of circles: very pretty.  Then, according to the Riemann mapping theorem you can map this disk in a conformal way onto a disk with 4 slits cut out.  The hard part is finding a formula for how to do it, and then implementing it on a computer.

For more details, try these picture-packed pages:

http://en.wikipedia.org/wiki/Conformal_map
http://en.wikipedia.org/wiki/Poincar%C3%A9_disk_model

and this more advanced one:

http://en.wikipedia.org/wiki/Riemann_mapping_theorem

#sciencesunday
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Have him in circles
410 people
Carlos Sanchez's profile photo
Laura Sestri's profile photo
Rajesh Belwadkar's profile photo
Federica Uccella's profile photo
Wander Bravo's profile photo
Lars Westman's profile photo
Felice Ip's profile photo
Mark Jolley's profile photo
Ordi Hossu's profile photo
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Open-Source Technologist
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  • Camptocamp SA
    Systems Engineer, 2012 - present
  • Alten
    Systems Engineer, 2010 - 2012
  • Orness
    Systems Engineer, 2006 - 2010
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  • ENSMA
    Mechanical Engineering
Très bonne pizzas et un magret de canard excellent.
Public - 4 years ago
reviewed 4 years ago
A unique place in Paris. Must see.
Public - 4 years ago
reviewed 4 years ago
5 reviews
Map
Map
Map
Les meilleurs burgers de Sophia.
Public - 4 years ago
reviewed 4 years ago
I stayed there for two nights with my wife and our daughter. The rooms are very nice and cosy, with very comfortable and large beds, and modern showers. The building is traditional, with a very nice and discrete decoration. We especially enjoyed the living room and the garden. The hotel is close to the center and the beach (croisette promenade). The owners speak quite a few languages, which is very helpful :-)
Public - 5 years ago
reviewed 5 years ago