Full Idea
Since C.B. Martin accepts both tropes and substances as fundamental, the claim that tropes are the only fundamental constituents is a further, independent claim.
Gist of Idea
We might treat both tropes and substances as fundamental, so we can't presume it is just tropes
Source
Chris Daly (Tropes [1995], §4)
Book Reference
'Properties', ed/tr. Mellor,D.H. /Oliver,A [OUP 1997], p.147
A Reaction
A dubious mode of argument. Martin may only make the claim because he is ignorant, of facts or of language. Why are some tropes perfectly similar? Is it the result of something more fundamental?