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D( r )
r = 0
10*r^-8 = 0
r = 0
r = 0
10*r^-8 = 0
10*r^-8 = 0
10*r^-8 = 0 // : 10
r^-8 = 0
r należy do O
r in (-oo:0) U (0:+oo)
(8*r^-6)/(10*r^-8) = 0
4/5*r^2 = 0 // : 4/5
r^2 = 0
r = 0
r in { 0}
r belongs to the empty set
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