Use tarskis world to give a counter example.

Reference no: EM13519562

Decide whether or not it is valid. If it is, use Fitch to give a formal proof. If it isn't, use Tarski's World to give a counter example.

(upsidedownA)x (Cube(x) V Tet(x))

(backwards E)x ¬Cube(x)

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(backwards E)x Tet(x)

Reference no: EM13519562

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