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Senior one math, what the hell is this m, point? Count? thank you
M(a, b) is just a symbol (where a and b are coefficients of the function f(x)),

Represents the maximum value of the function |f(x)| in the interval [- 1, 1].

So it stands for a number!

(Of course, this number varies with A and B, that is, it is a binary function of A and B)