Christopher Peisert
Creator, adventurer, student of life. Excited to be alive in a period of exponential technology growth.
Creator, adventurer, student of life. Excited to be alive in a period of exponential technology growth.
Christopher Peisert's posts
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Dinesh D'Souza poignantly illustrates the morality implicit in Obamacare:
No ObamaCare ﻿
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“The happiest I’ve ever been, the most gratification I’ve ever gotten from a job, are always instances where two things are true: I’m working with people that I love, and I’m solving a problem that I’m personally passionate about.”

Don't miss the latest Foundation interview by :  of  on reinventing radio – http://goo.gl/toubU﻿
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Excellent overview of Scala from its creator Martin Ordersky.
FOSDEM 2009 Scala - A Scalable Language﻿
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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

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

#sciencesunday﻿
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Want to create an online course? Check out Course Builder from Google!﻿
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Beautiful short film of Gêrome Pouvreau making the first ascent of Ganesh (5.14a/8B+) in Badami, India.

http://youtu.be/Y3UDkcH5KzI﻿
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Experience the beauty of the world through spectacular time lapses. ﻿
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Entertaining talk from Google I/O 2012 showcasing awesome new HTML5 features: "The Web Can Do That?!"