In this thesis, We investigate boundedness and compactness of pseudo-differential operators on a compact lie group G and offer a new sufficient condition for boundedness and compactness of these operators on L^{p})G), p> 1. In the case of G is a compact group, we give necessary and sufficient conditions on the symbols sigma, such that the corresponding pseudo-differential operators T_{sigma} from L^{p_{1}} (G) into L^{p_{2}} (G),1 < p_{1}, p_{2}
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