But if “plexists” means something like “I have an idea of it in my head”, then there is no substance to the claim that 3 plexists..3 is then no more real than a unicorn.
The number 3 has well-defined properties; such that I can be pretty sure that if I talk about 3 and you talk about 3, we’re talking about the same sort of thing. Sources on unicorns vary rather more broadly on the properties ascribed to them.
But if “plexists” means something like “I have an idea of it in my head”, then there is no substance to the claim that 3 plexists..3 is then no more real than a unicorn.
The number 3 has well-defined properties; such that I can be pretty sure that if I talk about 3 and you talk about 3, we’re talking about the same sort of thing. Sources on unicorns vary rather more broadly on the properties ascribed to them.
I don’t see what that has to do with existence. We could cook up a well-defined fubarosco-juno unicorn.