Show the following argument is valid using a derivation. Use only the BASIC RULES: MP, MT, ADD, MTP, ADJ, S, R, DN, CB, BC, EI, UI, and EG. ∃xGx→Ab. ∀z(~Az∨Hz). ∀y~Fy. ∴ ∀x(Gx∨Fx→∃zHz)
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Step 1: Assume the premise for every X, Gx or Fx. Show more…
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