求救:看得懂英文版高等数学的数学高手请进.
(TheSandwichTheorem)Giventwoconvergentsequences{an}and{cn}withthesamelimitlimn->∞an=L=limn->∞cn.Let{bn}beasequence.SupposethereexistsapositiveintegerKsuchthatforn≥K,wehavean≤bn≤cn.ThenbnconvergestoL.