main connective in SL

From: FiSH (a_fisher_at_hotmail)
Date: 08/26/04


Date: Thu, 26 Aug 2004 16:03:34 +1000

whats the main connective in these two logic strings, how can the main
connective be determined.

(¬P ? (Q ? ¬P)) ? Q

¬((P ? Q) v R) & ¬S

fish