問(wèn)答題

已知函數(shù)序列在(-∞,+∞)上收斂等于0,問(wèn)N(ε,x)取多大,能使當(dāng)n>N,時(shí)sn(x)與其極限之差的絕對(duì)值小于正數(shù)ε?


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