?G ? E $\frac { \mathrm { E } \supset \sim \mathrm { J } } { \sim \mathrm { G } \supset \sim \mathrm { J } }$
A) MP-valid.
B) HS-valid.
C) Invalid.
D) CD-valid.
E) DS-valid.

Question

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The Answer of ?G ? E $\frac { \mathrm { E } \supset \sim \mathrm { J } } { \sim \mathrm { G } \supset \sim \mathrm { J } }$
A) MP-valid.
B) HS-valid.
C) Invalid.
D) CD-valid.
E) DS-valid.

?G ? E E⊃∼J∼G⊃∼J\frac { \mathrm { E } \supset \sim \mathrm { J } } { \sim \mathrm { G } \supset \sim \mathrm { J } }∼G⊃∼JE⊃∼J​

?G ? E $\frac { \mathrm { E } \supset \sim \mathrm { J } } { \sim \mathrm { G } \supset \sim \mathrm { J } }$