A typical task in analysis is to decipher whether a propertypossessed by every term in a convergent sequence is necessarily inherited by the limit. Assume (an) → a, and determine the validity of each claim. Try to produce a counterexample for any that are false. (a) If every an is an upper bound for a set B, then a is also an upper boundfor B. (b) If every an is in the complement of the interval (0, 1), then a is also in the complement of (0, 1). (c) If every an is rational, then a is rational.

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A typical task in analysis is to decipher whether a property
possessed by every term in a convergent sequence is necessarily inherited by the limit. Assume (an) → a, and determine the validity of each claim. Try to produce a counterexample for any that are false.

(a) If every an is an upper bound for a set B, then a is also an upper bound
for B.

(b) If every an is in the complement of the interval (0, 1), then a is also in the complement of (0, 1).

(c) If every an is rational, then a is rational.

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