Otavio Kaminski
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 Jan21 answered Invertibility of laplacian operator Jan21 comment Invertibility of laplacian operator You are right, @Tomás. Jan14 comment Importance of Toeplitz operators? Thanks, @HaskellCurry, for your answer. This point is clear now. Your answer is enriching and I'll spend some time learning from it. Jan13 awarded Critic Jan9 comment Importance of Toeplitz operators? @HaskellCurry Really nice answer. But here is a (maybe silly) question: You said "It now follows from Atkinson's Theorem that if $f$ is invertible, then $T_{f}$ is a Fredholm operator." Did you really mean "invertible"? Invertible from $\mathbb{S}^{1}$ to $\mathbb{C}$ ? Dec8 comment Uniqueness existence for a PDE FALSE! Niemeyer is DEAD now. Oct29 accepted Finite dimensional quotient $\Rightarrow$ closedness? Oct29 asked Finite dimensional quotient $\Rightarrow$ closedness? Oct25 comment Redundant condition? What if the image is proper and dense? Thanks for your comment, @JonasMeyer. My question was "how many dimensions does $L^2/H^1$ have?" (or geometrically: how many dimensions are missing in $H^1$ to complete $L^2$ since $H^1$ is dense in $L^2$?) Oct25 comment Redundant condition? What if the image is proper and dense? Thanks for your comment, @bla. But $H^1(\Omega)$ is dense in $L^2(\Omega)$, what is the codimension of $H^1$? The answer you cited supposes finite codimension to begin with. Oct24 awarded Editor Oct24 revised Redundant condition? What if the image is proper and dense? corrected spelling Oct23 asked Redundant condition? What if the image is proper and dense? Sep25 awarded Scholar Sep25 accepted Green's function for periodic boundary condition Sep24 asked Green's function for periodic boundary condition Apr25 awarded Supporter Apr25 awarded Teacher Apr25 awarded Student Apr25 revised Convex hull of sets defined by (in)equalities Add tags