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(Sufficiency theses of this sort can be hammered into essentialist theses by holding individuals like Obama to have essential properties like occupying the qualitative role of the President in 2014 if the world is qualitatively as it actually is).
If Chisholm's Paradox is sound, the conclusion that Adam could occupy Noah's qualitative role entails haecceitism.
If, for example, we take Obama's actual qualitative role to be a sufficient condition for an object to be identical to Obama, we thereby rule out possibilities according to which some other individual occupies Obama's qualitative role.
In certain contexts, the second-born twin therefore represents a possibility for the firstborn namely, the possibility of occupying precisely the qualitative role of the second-born twin.
For example, some like Mackie (2006) take Chisholm's Paradox to lend support to a minimal essentialist view, according to which any object might occupy any given qualitative role, provided it retains its non-qualitative haecceity.
For example, just as hyperessentialism rules out any haecceitistic possibilities where you have a different qualitative role, origin essentialism rules out haecceitistic differences that involve organisms having anything other than their actual biological origins.
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One might reject certain instances of Chisholm's Paradox that require teacups to swap qualitative roles with tornadoes, but admit that other instances succeed in showing that distinct teacups might have swapped qualitative roles.
For example, while one might accept possibilities according to which two twins swap qualitative roles, one might deny that you and Obama could swap their respective roles.
Although essentialism provides no direct argument against haecceitism, hyperessentialism and other strong versions of essentialism do preclude certain kinds of haecceitistic differences where individuals "swap" qualitative roles.
Extreme haecceitism is therefore among the most permissive views about de re modality and admits possibilities where you occupy the qualitative roles of a poached egg.
According to extreme haecceitists, not only could Napoleon have been a poached egg, the world could have been qualitatively just as it actually is but such that a poached egg and Napoleon swap their respective qualitative roles.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com