Why are Invariants so special?

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  • Thread starter Thread starter NoodleDurh
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NoodleDurh
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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.
 
on Phys.org
"Invariants" don't change! That makes them much easier to work with than things that are changing.
 

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