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Why are Invariants so special?

  1. Apr 25, 2014 #1
    I only ask, because I noticed that the Euler Characteristic is an invariant and pops up in differential geometry as the G-B theorem. so could some one explain why they are special.
     
  2. jcsd
  3. Apr 25, 2014 #2

    HallsofIvy

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    "Invariants" don't change! That makes them much easier to work with than things that are changing.
     
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