1. 
   Yamabe problem
   The Yamabe problem in differential geometry concerns the existence of Riemannian metrics with constant scalar curvature, and takes its name from the mathematician Hidehiko Yamabe. Although {harvtxt|Yamabe|1960} claimed to have a solution in 1960, a critical error in his proof was discovered by {har...
   Found op http://en.wikipedia.org/wiki/Yamabe_problem
   
   

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