Suppose $T$ is a linear bounded operator on a Banach space $X$ over the complex field $\mathbb{C}$, and $T$ is surjective but not injective. Prove that $0$ is an interior point of the spectrum of $T$.
2026-04-09 03:50:57.1775706657
Prove that $0$ is in the interior of the spectrum a surjective linear operator
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