Question
What is ‘beautiful’?
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| (1) (A $\leftrightarrow$ B) $\rightarrow$ R | P |
| (2) ~ P v (B & D) | P |
| (3) B $\rightarrow$ (R S) | P |
| (4) ~ ~ P | P/ $\therefore$ D&[(A B) $\rightarrow$ S] |
| (5)B & D | ................ |
| (6) B | ................ |
| (7)R S | ................ |
| (8) (A $\leftrightarrow$ B) $\rightarrow$S | ................ |
| (9) D | ................ |
| (10) D & [(A $\leftrightarrow$ B) $\rightarrow$ S] | ................ |
| (1) (P & Q) $\rightarrow$ [P $\rightarrow$ (A & B)] | P |
| (2)(P & Q) & R | P/$\therefore$ A v B |
| (3)P & Q | ................ |
| (4) P $\rightarrow$ (A & B) | ................ |
| (5) P | ................ |
| (6)A & B | ................ |
| (7) A | ................ |
| (8)A v B | ................ |
| (1) (X $\rightarrow$ Y) $\rightarrow$ (A $\rightarrow$ B) | P |
| (2)(A $\rightarrow$ B) $\rightarrow$ R | P |
| (3) [(X $\rightarrow$ Y) $\rightarrow$ R] $\rightarrow$ K=J | P |
| (4) J $\rightarrow$ K | P/ $\therefore$ (J $\rightarrow$ K) & (J & K) |
| (5) ( X $\rightarrow$ Y) $\rightarrow$ R | ................ |
| (6) J | ................ |
| (7)K | ................ |
| (8) J & K | ................ |
| (9) (J $\rightarrow$ K) & (J &K) | ................ |