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Bounded $$H^\infty $$-calculus for a degenerate elliptic boundary value problem

Bounded $$H^\infty $$-calculus for a degenerate elliptic boundary value problem

Abstract On a manifold X with boundary and bounded geometry we consider a strongly elliptic second order operator A together with a degenerate boundary operator T of the form $$T=\varphi _0\gamma _0 + \varphi _1\gamma _1$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>T</mml:mi><mml:mo>=</mml:mo><mml:msub><mml:mi>φ</mml:mi><mml:mn>0</mml:mn></mml:msub><mml:msub><mml:mi>γ</mml:mi><mml:mn>0</mml:mn></mml:msub><mml:mo>+</mml:mo><mml:msub><mml:mi>φ</mml:mi><mml:mn>1</mml:mn></mml:msub><mml:msub><mml:mi>γ</mml:mi><mml:mn>1</mml:mn></mml:msub></mml:mrow></mml:math> . Here $$\gamma _0$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>γ</mml:mi><mml:mn>0</mml:mn></mml:msub></mml:math> and $$\gamma _1$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>γ</mml:mi><mml:mn>1</mml:mn></mml:msub></mml:math> denote …