1
$\begingroup$

I have read the book Function Theory of Several Complex Variables of Krantz. But there is a notation the meaning of which I don't know. The notation is $\subset\subset$. For example, "let $\Omega\subset\subset \mathbb{R}^{n}$ be a connected open set".

Can somebody give me a definition?

  • 0
    Is $\subset\subset$ the same as ⋐ ?2018-11-18

1 Answers 1

3

There's an index of notation at the back of the book. Apparently, $\subset \subset$ means ‘relatively compact in’ and is defined in section 1.1.

  • 0
    I have checked the index of notation of the book,but I don't find it.I just need some conclusions from this book,so I don't read this book carefully.Thank you for your help.2011-08-11