This publication develops 3 similar instruments which are necessary within the research of partial differential equations (PDEs), coming up from the classical learn of singular vital operators: pseudodifferential operators, paradifferential operators, and layer potentials. A subject matter working through the paintings is the therapy of PDE within the presence of really little regularity. the 1st bankruptcy stories periods of pseudodifferential operators whose symbols have a constrained measure of regularity; the second one bankruptcy exhibits how paradifferential operators yield sharp estimates at the motion of assorted nonlinear operators on functionality areas. The 3rd bankruptcy applies this fabric to an collection of leads to PDE, together with regularity effects for elliptic PDE with tough coefficients, planar fluid flows on tough domain names, estimates on Riemannian manifolds given susceptible bounds on Ricci tensor, div-curl estimates, and effects on propagation of singularities for wave equations with tough coefficients. The final bankruptcy stories the tactic of layer potentials on Lipschitz domain names, focusing on functions to boundary difficulties for elliptic PDE with variable coefficients.

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