What is the reason behind proper mass being invariant?

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SUMMARY

Proper mass is invariant across different frames of reference, meaning it remains constant regardless of the observer's motion. This invariance is crucial for simplifying mathematical formulations in physics, as it allows all observers to agree on a fundamental property of an object. The significance of proper mass is well-documented in sources such as Wikipedia, emphasizing its role in maintaining consistency in physical laws.

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we know proper mass is always constant irrespective of frame ie its invariant(and conserved if I can say).so what's reason for this proper mass.?
 
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The reason it is important to use proper mass is well described in wikipedia:
http://en.wikipedia.org/wiki/Invariant_mass

... generally it is useful to look for things that all observers can agree on - it makes the math simpler.
 

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