Abstract
A seminorm with square property on a real associative algebra is submultiplicative.
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El Azhari, M. A real seminorm with square property is submultiplicative. Indian J Pure Appl Math 43, 303–307 (2012). https://doi.org/10.1007/s13226-012-0018-z
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DOI: https://doi.org/10.1007/s13226-012-0018-z