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  • noun Plural form of thisness.


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  • Suppose we take identity to be a relation and analyse thisnesses as relational properties, (So A's thisness is analysed as being identical to A).

    The Identity of Indiscernibles Forrest, Peter 2006

  • The possibility of resorting to thisnesses might make us query whether the usual formulation of the Principle is correct.

    The Identity of Indiscernibles Forrest, Peter 2006

  • As thisnesses are the formal principles in virtue of which individuals are what they are, something particular, concrete, and perfectly determined in itself, so these individual causal principles deriving from ideas are what causes the passage from the specific ideal standard to the analytical description of its instantiations (QdU, fol. 135ra).

    Paul of Venice Conti, Alessandro 2005


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