When I use the following code it returns 0.
var('x y')
def f1(x,y):
if(x+y < 5):
return x+y
else:
return 0
integral(integral(f1(x,y), x, 0,1), y, 0, 1)
whereas
integral(integral(x+y, x, 0,1), y, 0, 1)
returns 1.
Can any one point out the reason for this discrepancy and how to solve it?
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