Let  f(x,y)  be a function such that
    integral(f(x,y),y,0,x)
doesn't evaluate to anything simpler, such as
    f(x,y) = (y+1)  ^ (y+1) ^ x

How can I then compute the (definite) integral of f over the region
    0 <= y <= x <= 1

I want a numeric integration, but
   numerical_integral(numerical_integral(f,0,x),0,1)
doesn't work, since f takes two parameters, not one.  And
   numerical_integral(integral(f(x,y),y,0,x),0,1)
doesn't work either, since the inner integral doesn't evaluate.

I couldn't find guidance on this in the documentation or elsewhere...
(Please let me know if this request should be posted elsewhere instead
of here...)

Thanks!

Cheers,
Ron Rivest

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