- #1

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∫...∫exp(-(a+b*x1+c*x1*x4+d*x3*x4+f*x2*x3*x4)^2)dx1dx2dx3dx4

a,b,c,d,f - real constants;

x1,x2,x3,x4 - real variables;

borders of integration are finite, let say for x1 it is [x1a,x1b] and so on for the rest of them;

i'v tried to solve it in terms of tensor vector multiplication. it solvable on paper but it's practical realization is rather impossible.

so i would be appreciate for any pointers or directions for solution.

thanks in advance