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D( J )
J = 0
J = 0
J = 0
J in (-oo:0) U (0:+oo)
918/J = 18 // - 18
918/J-18 = 0
918*J^-1 = 18 // : 918
J^-1 = 1/51
-1 < 0
1/(J^1) = 1/51 // * J^1
1 = 1/51*J^1 // : 1/51
51 = J^1
J = 51
J = 51
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