Abstract Let $X$ be a topological ring. In this paper, we consider the
three classes ($btb$-bounded, $tbtb$-bounded, and $tbb$-bounded)
of endomorphisms defined on $X$ and denote these classes by
$B_{btb}(X), B_{tbtb}(X)$, and $B_{tbb}(X)$, respectively. We
equip them with an appropriate topology and we find some
sufficient conditions under which, each class of these
endomorphisms is complete.
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