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Technocratic_Utilitarian said:I think this is the proper structure. It has been a long time since I studied logic.
1. Modus Ponens Format: Typically, Modus Ponens affirms the antecedent, thus affirming the consequent. In an if only if then statement, however, it is valid to negate the antecedent to negate the consequent. The consequent is valid if and only if the antecedent is valid.
IE. If and only if I eat apples, do I go to the park. I do not eat apples, therefore, I don't go to the park. Y can ONLY exist if X exists.
X------Y,
Not X
Ergo, not Y
If and only if the nature of a species is present, then the member is a person. Refined, this means, if and only if a member of a species has, rationality, self-awareness, and abstract conceptualization, then it is a Person. How does this relate to our problem? This is an if/only/if then statement in the form of Modus Ponens. In this case, the antecedent is not met in mindless blobs of flesh, ergo, those mindles blobs of flesh are not persons. Not X = Not Y, because of the "only" qualifer.
Someone please correct me on this, but I checked it up on the if and only if then statements, and it seems correct:
http://richardbowles.tripod.com/gmat/cr/logic.htm#mp
I guess I don't understand the relevence of this equasion. If the species itself is the determiner of the teleological view of "person" or "personhood"--by definition if it is the member of a species, it has the "nature" of said species.