Hi All,(adsbygoogle = window.adsbygoogle || []).push({});

Sorry, to begin with, if the question seems to be out of place. My question has to do with the notation (#) for the number of elements in a set:

$$ N = \# \{ v_i \in V \vert v_i v_j \in E \} $$

Is it well known? If written in a scientific communication, must one offer a description of its meaning?

Best Regards,

DaTario

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# I Question about notation in set theory

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