There are many papers in which using the fixed point theory we obtain the surjectivity of1X−f (see: Aldea [1, 2], Browder [4], Danes [8], Danes-Kolomy [9], Deimling [10], Rus
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This decay is polynomial with t : we show in theorem 4.1 an upper bound of the order of Ct 2−γ when γ > 2; this estimate is sharp in the sense that for each γ there exist functions
