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D( a )
4*a^-1 = 0
a = 0
4*a^-1 = 0
4*a^-1 = 0
4*a^-1 = 0 // : 4
a^-1 = 0
a należy do O
a = 0
a = 0
a in (-oo:0) U (0:+oo)
1/(4*a^-1) = 0
1/4*a = 0 // : 1/4
a = 0
a in { 0}
a belongs to the empty set
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