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D( p )
p*p = 0
p = 0
p*p = 0
p*p = 0
1*p^2 = 0 // : 1
p^2 = 0
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
2/p-(1/p)-1+1 = (2*p)/(p*p)-1 // - (2*p)/(p*p)-1
2/p-(1/p)-((2*p)/(p*p))-1+1+1 = 0
2/p-p^-1-2*p^-1-1+1+1 = 0
-1*p^-1 = -1 // : -1
p^-1 = 1
-1 < 0
1/(p^1) = 1 // * p^1
1 = 1*p^1 // : 1
1 = p^1
p = 1
p = 1
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