Abstract
We give a simple and easy proof of a result obtained by W. Rehder who generalized, in his turn, a famous result by Beck and Putnam. We then give a generalization to unbounded operators.
Citation
Mohammed Hichem Mortad. "On a Beck-Putnam-Rehder Theorem." Bull. Belg. Math. Soc. Simon Stevin 17 (4) 737 - 740, november 2010. https://doi.org/10.36045/bbms/1290608198
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