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Questions related to various forms of integration including the Riemann integral, Lebesgue integral, Riemann–Stieltjes integral, double integrals, line integrals, contour integrals, surface integrals, integrals of differential forms, ...

1 vote
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Help trying to show that $p_0a_1 =0$ [closed]

Let $A$ be a Banach algebra and let $\Gamma_0, \Gamma_1$ be circles of centres 0 and 1 respectively, each of radius less that $\frac{1}{2}$, which bound the two open disks $\Delta_0$ and $\Delta_1$ …