why sup x in [a,b] |Pn(x) - f(x) | < ϵ , Pn(x)=a0+a1x+....+anx^n(adsbygoogle = window.adsbygoogle || []).push({});

why f(x)-ϵ<Pn(x)<f(x)+ϵ

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# B S u p x i n [ a , b ] | P n ( x ) − f ( x ) | < ϵ

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