Juno_Watt comments on What do professional philosophers believe, and why? - Less Wrong Discussion
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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.