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Meaning of mathematic operator

  1. Oct 20, 2011 #1
    1. The problem statement, all variables and given/known data
    What is the difference between ≤ (less than or equal to) and "less than over equal to" (the operator is similar but there are 2 lines under the 'less than' operator)

    2. Relevant equations

    3. The attempt at a solution
    I simply do not know the difference. And how to use the operator "less than over equal to" ?

  2. jcsd
  3. Oct 20, 2011 #2

    Ray Vickson

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    They mean the same thing; they are just two slightly different notations for the same concept.

    Last edited: Oct 20, 2011
  4. Oct 20, 2011 #3
    If they mean the same thing (I mean 100% same, no difference at all), why are there two notations?

    Maybe this will help me more:
    1. Is x ≤ 3 the same as x less than over equal to 3 ?

    2. Are there any cases we must use "less than over equal to", not ≤ ?

    Thanks RGV
  5. Oct 20, 2011 #4


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    Last edited by a moderator: Apr 26, 2017
  6. Oct 20, 2011 #5
    I don't really understand that vector inequalities. I think it means that in vector inequalities, if x ≤ y, it means that x ≠ y.

    Maybe you want to tell me that one of the application of "less than over equal to" is in vector inequalities.

    Last edited by a moderator: Apr 26, 2017
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