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D( m )
m^4 = 0
m^4 = 0
m^4 = 0
1*m^4 = 0 // : 1
m^4 = 0
m = 0
m in (-oo:0) U (0:+oo)
(4*7*m^4*m^5)/(m^4) = 0
28*m^5 = 0 // : 28
m^5 = 0
m = 0
m in { 0}
m belongs to the empty set
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