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Finding nonclassical counterexamples

Here is a random argument! (Premises above the line; conclusion below it)

  • ¬(w ∨ w)
  • f
  • ---------------
  • c ∨ ¬¬j

Give a counterexample to this argument in the LP matrix, if there is one!

Note that the matrix can change from one argument to the next, so stay alert!

c

f

j

w