Given the argument: M ⊃ J / ∼ J ⊃ R // (M ∨ ∼ R) ⊃ J   Th…

Questions

Given the аrgument: M ⊃ J / ∼ J ⊃ R // (M ∨ ∼ R) ⊃ J   This аrgument is: