대한수학회보 (Bulletin of the Korean Mathematical Society)
- 제33권1호
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- Pages.35-38
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- 1996
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- 1015-8634(pISSN)
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- 2234-3016(eISSN)
A metric characterization of Hilbert spaces
초록
The aim of this paper is to present a characterization of Hilbert spaces in terms of the lengths of four sides and two diagonals of a parallelogram.