From: &noreply@axelvogt.de   
      
   On 02.07.2014 14:34, paulandrewbird@gmail.com wrote:   
   > On Tuesday, 1 July 2014 20:43:02 UTC+1, Axel Vogt  wrote:   
   >> Do you have any (numerical) examples where your guess might be correct?   
   >   
   > My guess is simply based on the similarity to the quadratic integral:   
   >   
   > Integral[ exp(-A_ij x_i x_j )]dx^n = sqrt(pi^n / det(A) )   
      
   If you mean the sum: for matrix = unit matrix then it is   
   exp( x^2 + y^2 ) to be integrated over the plane, which   
   is infinity, while det = 1. So at least you need sign   
   conditions ( A = - Id will do)   
      
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