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Functions with at most linear growth at infinity: is the constant itself continuous?

The answer is no to both your hopes: it can happen that neither $M_{f_n}\to M_f$ nor $\sup_n M_{f_n}<+\infty$ hold, although $M_f<\infty$. As a counter-example take $$ f_n(x)=\max(0,n(x-n)). $$ (I'm t …
leo monsaingeon's user avatar