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II Establishing Invalidity For each sequent, provide an interpretation that renders it invalid and set out...
Provide natural deductions to demonstrate the following. (The only new rules needed for these are 3-Introduction and V-Elimination. You may also use the Derived Rules from TFL [useful for #2!).) [5pts each] 1. Vx(FxGx) + 3x (GxA3yFy) 2. Vx(FxVGx), Vy-Gy+ 3z(FzA-Gz) 3. VxTyRxy + 3y=xRxy 4. Vx(Fx→ VyHy) = x(VyFyHx) Optional Bonus: give a proof of the following: VxWyAxy + 2x(ByAyx A VyAxy) Derived Rule: DS Sequent: SIVB-BH VB, HB B -B- ABS E B BVB (9 +8) HH SẢN...