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

Question

Quizplus · Accepted Answer

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

?D ? ?C R⊃∼DR⊃∼C\frac { \mathrm { R } \supset \sim \mathrm { D } } { \mathrm { R } \supset \sim \mathrm { C } }R⊃∼CR⊃∼D​

?D ? ?C $\frac { \mathrm { R } \supset \sim \mathrm { D } } { \mathrm { R } \supset \sim \mathrm { C } }$