Question
Write the formula of the opposite method.
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| (1)(T $\rightarrow$ K) & S | P |
| (2) ~ P $\rightarrow$ (A $\rightarrow$ B) | P |
| (3) P v (T v A) | P |
| (4) ~ P | P/$\therefore$ K v B |
| (5) T $\rightarrow$ K | |
| (6) A $\rightarrow$ B | |
| (7) T v A | |
| (8)K v B |
| (1)A $\rightarrow$ B | P |
| (2)R $\rightarrow$ S | P |
| (3)(H $\rightarrow$ J) & (J $\rightarrow$ K) | P |
| (4) (A v R) &(H v J) | P/$\therefore$ (J v K) & (B v S) |
| (5) A v R | ................ |
| (6) B v S | ................ |
| (7) J $\rightarrow$ K | ................ |
| (8)H $\rightarrow$ J | ................ |
| (9) H v J | ................ |
| (10) J v K | ................ |
| (11) (J v K) & (B v S) | ................ |