Question
What is the characteristic of external value according to Prof. Wright?
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| (1) [B v (~ A v D)] & (A v B) | P |
| (2) ~ B | P/ $\therefore$ (~A v D) & (~ B v ~ D) |
| (3 ) B v( ~A v D) | ................ |
| (4)~A v D | ................ |
| (5) ~ B v ~ D | ................ |
| (6) (~A v D) & (~B v ~D) | ................ |
| (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 & R) v ~ S | P |
| (2) (P & R) $\rightarrow$ ~ | P |
| (3) M $\rightarrow$ ~ ~ T | P |
| (4) ~ S $\rightarrow$ (A & B) | P |
| (5) M | P/$\therefore$ A v (R & S) |
| (6) ~ ~ T | ................ |
| (7) ~(P&R) | ................ |
| (8) ~ S | ................ |
| (9) A & B | ................ |
| (10) A | ................ |
| (11) A v (R & S) | ................ |