If $T$ is a bounded linear operator on a normed space $X$, what does "$T$ is a regular operator" mean?
2026-03-29 10:18:35.1774779515
What is the definition of a regular operator?
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One definition I saw was: $T$ is invertible and its inverse is also bounded. The reference is this paper http://www.liusb.com/pdf/amm.pdf