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An odd inequality sign

  1. Aug 17, 2011 #1
    I saw this rather odd symbol of the the greater sign on top of the less sign in my lecture notes. I am wondering if there is a name for this symbol and if signifies 'equal to' as well?
  2. jcsd
  3. Aug 17, 2011 #2


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    I would interpret that as "is not equal to".
  4. Aug 17, 2011 #3
    Is it any of these?

    [tex]\lessgtr, \quad
  5. Aug 17, 2011 #4
    I'd say it'd probably be the second one.
  6. Aug 18, 2011 #5


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    Again, my best guess is "is not equal to".
  7. Aug 20, 2011 #6


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    It's an abbreviation of < or >, the alternatives being explained or elaborated on nearby.

    You could write: a≶b≶c, which means that either a<b<c or a>b>c.
    Or you could write something like: |x|=±x if x≷0.
    The upper level is one case, the lower level is the other case.

    It is rarely used. Different cases are usually put on different lines with braced conditions.
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