dict.org

The DICT Development Group


Search for:
Search type:
Database:

Database copyright information
Server information


1 definition found
 for hairy ball
From The Free On-line Dictionary of Computing (30 December 2018) :

  hairy ball
  
      A result in topology stating that a continuous
     vector field on a sphere is always zero somewhere.  The name
     comes from the fact that you can't flatten all the hair on a
     hairy ball, like a tennis ball, there will always be a tuft
     somewhere (where the tangential projection of the hair is
     zero).  An immediate corollary to this theorem is that for any
     continuous map f of the sphere into itself there is a point
     x such that f(x)=x or f(x) is the antipode of x.  Another
     corollary is that at any moment somewhere on the Earth there
     is no wind.
  
     (2002-01-07)
  

Contact=webmaster@dict.org Specification=RFC 2229