Abstract
The triangle inequality for real and complex numbers are basic and appear in any analysis book.
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Mitrinović, D.S., Pečarić, J.E., Fink, A.M. (1993). Triangle Inequalities. In: Classical and New Inequalities in Analysis. Mathematics and Its Applications (East European Series), vol 61. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-1043-5_17
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DOI: https://doi.org/10.1007/978-94-017-1043-5_17
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