I'm interested in thing that are norms except for the fact that they satisfy the reverse triangle inequality [tex] ||x+y|| \geq ||x|| + ||y||[/tex]. The obvious example is taking p-norms for 0<p<1. Does anyone know of others or if there's any theory developed on this topic?(adsbygoogle = window.adsbygoogle || []).push({});

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# P-norms for p<1

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