Mathematics – Classical Analysis and ODEs
Scientific paper
2008-10-17
Mathematics
Classical Analysis and ODEs
Text of the lectures given at the El Escorial 2008 conference. Revised after the suggestions of the referee. Some historical m
Scientific paper
We provide a direct proof of a quadratic estimate that plays a central role in the determination of domains of square roots of elliptic operators and, as shown more recently, in some boundary value problems with $L^2$ boundary data. We develop the application to the Kato conjecture and to a Neumann problem. This quadratic estimate enjoys some equivalent forms in various settings. This gives new results in the functional calculus of Dirac type operators on forms.
Auscher Pascal
Axelsson Andreas
McIntosh Alan
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