Mathematical symbol: maxmax &；; & grey theory

Consider that {x_n(t)} is a series of functions of r → r

|x_0(t)-x_s(t)| indicates the distance difference between the fourth function and the 0th function in this series when x=t, then max(t)|x_0(t)-x_s(t)| indicates the maximum distance difference when t traverses the definition domain, that is, x_0 and x.then max (.

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