Let $T:H_0^2(D)\rightarrow H_0^2(D)$ a linear bounded operator defined via the sesqulinear form $(Tu,v)=a(u,v):=\int_{D}\Delta u\Delta v dx$. I have shown that T is coercive and self-adjoint. How can i proove that T is invertible; thanks
2026-05-04 20:15:35.1777925735
invertible operator Sobolev space
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