What is the difference between l subscript infinity and l superscript infinity?

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SUMMARY

The discussion clarifies that there is a distinction between \( l_{\infty} \) and \( l^{\infty} \). The notation \( l^{\infty} \) refers specifically to the space of bounded sequences, while \( l_{\infty} \) is often used interchangeably but can imply a different context. The more common notation for this space is indeed \( \ell^{\infty} \), which denotes the set of all bounded infinite sequences.

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  • Understanding of sequence spaces in functional analysis
  • Familiarity with mathematical notation, particularly subscripts and superscripts
  • Basic knowledge of bounded sequences
  • Concepts of convergence in infinite-dimensional spaces
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bugatti79
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Folks,

Is there a difference between l subscript infinity and l superscript infinity. I believe the latter is the space if bounded sequences?

thanks
 
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I believe they both mean the same thing - the space of bounded infinite sequences. The more usual notation uses, I believe, superscript notation, like so
[tex]\ell^{\infty}[/tex]
 

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