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  Hyperbolic Planar Tesselations

  Hyperbolic Planar Tesselations by Don Hatch Here are pictures of some regular tesselations of the hyperbolic plane. Each tesselation is represented by a Schlafli symbol of the form {p,q}, which means that q regular p-gons surround each vertex. There exists a hyperbolic tesselation {p,q} for ...

  Dan Freeman added 9 months ago

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  The Brightness of Colour - fMRI study

  [...] stimuli that are more saturated (i.e. purer in colour) appear brighter than stimuli that are less saturated at the same luminance. Similarly, stimuli that are red or blue appear brighter than equiluminant yellow and green stimuli. This non-linear relationship between stimulus intensity and ...

  Dan Freeman added 10 months ago

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  Travel for Change

  Great idea - donate frequent flyer miles to help Obama campaign volunteers get to battleground states.

  Dan Freeman added 17 months ago

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  is there a way to track Twine beta test invitations sent?

  I've sent a fw invitations for new users to join the Twine beta test.  But I don't see any way to track invitations I've sent that have not yet been responded to. (That is to say, I want to be sure I don't forget having already sent an invitation, to avoid sending yet another invitation to a ...

  Dan Freeman added 17 months ago

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  cloud computing blogs

  list of blogs discussing cloud computing

  Dan Freeman added 17 months ago

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