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Lecture

Identity and PL Truth Trees

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Department
Philosophy
Course
PHILOS 2B03
Professor
Richard Arthur
Semester
Fall

Description
Identity PL Truth TreesThe only planet known to support LIFE is Earth But Earth is not OUTSIDE our star system So no planet known to support LIFE is OUTSIDE our systemSubstitution of Identicals If two individuals I and k are identical then k can be substituted for I in any statement involving i Lex Lxx e PremOe PremLe 1 Simpx Lxxe 1 Simp 5 LuSuppCP 6 Luue 4 UI 7 ue 56 MP 8 Ou27 SI 9 LuOu5
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