Russell:
If we are referring to something; it is assumed we are referring to something that exists, rather than something imaginary.
HOWEVER... we can easily refer to a unicorn; a work of fiction.
Moore:
- "Some tame tigers do not growl" - meaningful statement, as it tells us such beings exist and a describes a characteristic of the aforementioned being
- "Tame tigers do not exist" is a meaningless statement as we learn nothing from it, apart from the fact that they do not exist; therefore we should not even talk about them
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