What symbol is this?

  • #1

Main Question or Discussion Point

Hi. I was reading a chapter about Stationary Phase Method and I got stuck with this symbol [itex]\Subset[/itex]. I looked it up on tables os mathematical symbols but could not find its meaning.

Can you help me?

Thank you.
 

Answers and Replies

  • #2
15
0
I was reading about that from here http://www.math.ku.dk/~gimperlein/dif11/dif11_kim_stationaryphase.pdf [Broken] but saw no such symbol. What's your source?
 
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  • #3
http://www.math.purdue.edu/~sfholman/dHHU_Chap2.pdf [Broken]


First page, definition 2.1
 
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  • #4
191
8
This seems more like a math question to me (I've only seen it in functional analysis), but anyway. In this (and most cases), [itex]\Subset[/itex] tends to be used as an alternative to (the in my opinion rather ugly) [itex]\subset\subset[/itex], and means that one set is compactly contained (or embedded) in the other. For many intents and purposes, you can mentally replace [itex]\Subset[/itex] by the usual subset symbols ([itex]\subset[/itex] or [itex]\subseteq[/itex]).
 

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