Let (an) be a bounded sequence, and define the set                   S = {x ∈ R : x < an for infinitely many terms an}. Show that there exists a subsequence (ank) converging to s = supS. (This is adirect proof of the Bolzano–Weierstrass Theorem using the Axiom ofCompleteness.)

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Let (an) be a bounded sequence, and define the set

                  S = {x ∈ R : x < an for infinitely many terms an}.

Show that there exists a subsequence (ank) converging to s = supS. (This is a
direct proof of the Bolzano–Weierstrass Theorem using the Axiom of
Completeness.)

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