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Question Number 7499 by Tawakalitu. last updated on 31/Aug/16

Let E be a banach space , Y is normed space and   suppose that {Ta : a∈A} ⊆  B (E, Y) If {Tax : a∈A}  ⊆ Y is bounded , for all x∈E, then {∥Ta∥ : a∈A} is   bounded.

$${Let}\:{E}\:{be}\:{a}\:{banach}\:{space}\:,\:{Y}\:{is}\:{normed}\:{space}\:{and}\: \\ $$$${suppose}\:{that}\:\left\{{Ta}\::\:{a}\in{A}\right\}\:\subseteq\:\:{B}\:\left({E},\:{Y}\right)\:{If}\:\left\{{Tax}\::\:{a}\in{A}\right\} \\ $$$$\subseteq\:{Y}\:{is}\:{bounded}\:,\:{for}\:{all}\:{x}\in{E},\:{then}\:\left\{\parallel{Ta}\parallel\::\:{a}\in{A}\right\}\:{is}\: \\ $$$${bounded}. \\ $$

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