What does "exist" mean to a physicist? somt

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wittgenstein
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If something hat has no volume and no mass can exist ,what does it mean to say that something physical exists?
 

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Sorry about the tablet problems (somt in the title and "hat" not "that")
 
I am referring to point and massless particles
 
This is a philosophical question (ontology). Please review the forum rules on philosophy.
 

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