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D( f )
f = 0
f = 0
f = 0
f in (-oo:0) U (0:+oo)
7/f = 7/11 // - 7/11
7/f-(7/11) = 0
7/f-7/11 = 0
7*f^-1 = 7/11 // : 7
f^-1 = 1/11
-1 < 0
1/(f^1) = 1/11 // * f^1
1 = 1/11*f^1 // : 1/11
11 = f^1
f = 11
f = 11
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