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Full Idea
We can call the 'transference principle' the claim that if it is indeterminate whether two objects are identical, then nothing determinately true of one can be determinately false of the other.
Gist of Idea
If two things might be identical, there can't be something true of one and false of the other
Source
Katherine Hawley (How Things Persist [2001], 4.9)
Book Ref
Hawley,Katherine: 'How Things Persist' [OUP 2004], p.124
A Reaction
The point is that Leibniz's Law could immediately be invoked to show there is no possibility of their identity.
Related Idea
Idea 16224 There can't be vague identity; a and b must differ, since a, unlike b, is only vaguely the same as b [Evans, by PG]