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amelius 1 hours ago [-]
Stopped reading when they used |·| without explaining its meaning.
bustermellotron 1 hours ago [-]
Size of a finite set. It’s common notation in this field.
amelius 39 minutes ago [-]
Ok, I guess I'm always confused why |S| on a set doesn't take the values into account, whereas |x| on a vector does take its values into account; how can mathematicians of all people be so inconsistent?
2 minutes ago [-]
layer8 16 minutes ago [-]
Mathematicians use inconsistent notations all the time. Symbols meaning slightly different things based on the type of the arguments are among the benign cases.
For the present case, see https://en.wikipedia.org/wiki/Vertical_bar#Mathematics.