For Existential Instantiation, the constant we instantiate to may not occur earlier in our proof.
Correct Answer:
Verified
Q57: Fa • Ga is an instantiation (by
Q58: One can correctly move from ~(x)Gx to
Q59: Existential Instantiation and Universal Instantiation are both
Q60: One can correctly move from ($x)Cx to
Q61: Fa • Ga is an instance of
Q63: In applying EI, we instantiate to an
Q64: Correctly using Universal Generalization on Bc →
Q65: From Fc • Bc we can validly
Q66: (x)~Fx is logically equivalent to ~($x)Fx.
Q67: Quantifier negation is an equivalence rule.
Unlock this Answer For Free Now!
View this answer and more for free by performing one of the following actions
Scan the QR code to install the App and get 2 free unlocks
Unlock quizzes for free by uploading documents