The following example arises from a quation on Mathoverflow, and is the expectation of the absolute value of difference between two Poisson variables.
summation( abs(x-y)*exp(x+y)/(factorial(x)*factorial(y)),(x,0,oo),(y,0,oo)) which is only returned symbolically. According to some answers, this should be expressible using Bessel functions. http://mathoverflow.net/questions/104008/e-x-y-where-x-and-y-are-independent-poisson-random-variable Kjetil -- "If you want a picture of the future - imagine a boot stamping on the human face - forever." George Orwell (1984) -- You received this message because you are subscribed to the Google Groups "sympy" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/sympy?hl=en.
