What does it mean for a set to be bounded?

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A set is defined as bounded in the context of the Heine-Borel theorem if there exists a positive constant M such that for all elements x in the set S, the norm |x| is less than M. An equivalent definition states that a set has finite diameter, represented mathematically as diam(S) = sup_{x, y in S}(dist(x, y)). This definition is applicable to any metric space, although the Heine-Borel theorem itself is specific to subsets of Rn.

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royzizzle
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what does it mean for a set to be bounded??

in the context of the hein-borel theorem

i mean the mathematically rigorous definition
 
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S a subset of Rn is bounded if there exists M>0 so that for all x in S, |x|<M
 


Another equivalent definition is that it has finite diameter, where

\mathrm{diam}(S) = \sup_{x, y \in S}(\mathrm{dist}(x, y)).

This is applicable to any metric space (though the Heine-Borel theorem is not!).
 

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