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"sup" in functional analysis

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a_ronagh

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Hi

I have encountered an abbreviation "sup" in an article
just as below:

d(x,y)=sup|x(t)-y(t)|

What does "sup" stands for in functional analysis?
I am a beginner in this issue.Please explane it a little.

Thank you so much.
 

"SUP" is a concept in functional analysis, which means: the least one still larger than the element in the set you concerned.
 

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