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Equal sign with a triagle above it?

  1. Mar 12, 2004 #1
    In my EM text book it uses a equal sign with a triangle on top to define the intrinsic impedence of a lossless medium.

    I think it means definition but I'm not certain.

    The text is 2004 edition of author Ulaby titled Fundametals of Applied Electromagnetics, pg. 265.

    Thanks
     
  2. jcsd
  3. Mar 12, 2004 #2

    jamesrc

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    You're right. This symbol: [tex] \triangleq [/tex] means that it is equal to by definition.

    I've also seen the three lined equal sign, [tex] \equiv [/tex], used in definition statements.
     
  4. Mar 13, 2004 #3
    Thanks.
     
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