# Notation for compact sets?

Is there some accepted notation for a set that is compact?

E.g. I am currently writing "... [blah] is true if for every compact set $$A \subset \mathbb{R}^n$$ and ...".

I could simplify my writing if there was some notation that meant the set $$A$$ is compact.

Thank you,

• None that I am aware of, but I hope you are saying “for every compact set $A\subseteq \mathbb{R}^n$” rather than $A\in\mathbb{R}^n$... – Arturo Magidin Feb 4 '19 at 0:02
• Yes - thanks for the correction :) – aaronsnoswell Feb 4 '19 at 0:53

$$K$$ is often used for compact sets, but (to my knowledge) there is no notation that definitively designates a set as compact. If you just said "for every $$K \subseteq \mathbb{R}^n...$$ the reader could not infer that $$K$$ is compact.