Teorema paralelogramului (Romanian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Teorema paralelogramului" in Romanian language version.

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en Cantrell, Cyrus D. (2000). Modern mathematical methods for physicists and engineers. Cambridge University Press. p. 535. ISBN 0-521-59827-3. if p ≠ 2, there is no inner product such that ${\sqrt {\langle x,\ x\rangle }}=\|x\|_{p}$ because the p-norm violates the parallelogram law.
en Saxe, Karen (2002). Beginning functional analysis. Springer. p. 10. ISBN 0-387-95224-1.

en Apostol, Tom M. (1967). „Ptolemy's Inequality and the Chordal Metric”. Mathematics Magazine (în engleză). 40 (5): 233–235. doi:10.2307/2688275. JSTOR 2688275.

en Apostol, Tom M. (1967). „Ptolemy's Inequality and the Chordal Metric”. Mathematics Magazine (în engleză). 40 (5): 233–235. doi:10.2307/2688275. JSTOR 2688275.

en Apostol, Tom M. (1967). „Ptolemy's Inequality and the Chordal Metric”. Mathematics Magazine (în engleză). 40 (5): 233–235. doi:10.2307/2688275. JSTOR 2688275.

Viorica Ungureanu, Mădălina Buneci, Algebră Liniară: teorie și aplicații, Timișoara: Ed. Mirton, 2004, ISBN: 973-661-479-4, Cap 5, Spații vectoriale euclidiene/unitare, accesat 2022-05-02, p. 250