) I 0) then the equation ao(r)u2 tb"(ae)u+c,(") has the sarne sign as a"(x)for any u ? IR ( respectively, for any u? IR\{-6, (x) l2a,(x)}), and since tr/ is a clf for the system (6.2), in order to have (6.b) we -uJ hu-.,à'à"@)'a'0'.' On the other ha1d ,
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we have LV(x) : o,(r)u'(x) + b,(ae)u(r) + c, where ur(*) : u(r)u(ae) ,
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