The study of global solvability and hypoellipticity of differential operators on manifolds has attained increasing prominence over recent decades. At its core, global solvability investigates the ...
Transactions of the American Mathematical Society, Vol. 347, No. 10 (Oct., 1995), pp. 3671-3742 (72 pages) Results in the spectral theory of differential operators, and recent results on conformally ...
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