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D( r )
r^(3/4) = 0
r < 0
r^(3/4) = 0
r^(3/4) = 0
1*r^(3/4) = 0 // : 1
r^(3/4) = 0
r = 0
r < 0
r in (0:+oo)
(5*r^(7/8))/(r^(3/4)) = 0
5*r^(1/8) = 0 // : 5
r^(1/8) = 0
r = 0
r in { 0}
r belongs to the empty set
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