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What symbol is this?

  1. Mar 25, 2014 #1
    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.
  2. jcsd
  3. Mar 25, 2014 #2
    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?
    Last edited by a moderator: May 6, 2017
  4. Mar 25, 2014 #3
    http://www.math.purdue.edu/~sfholman/dHHU_Chap2.pdf [Broken]

    First page, definition 2.1
    Last edited by a moderator: May 6, 2017
  5. Mar 25, 2014 #4
    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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