Hi all,

I have been trying to solve this question for a while with no luck at all. This is related to Propositonal Logic. Can someone please help? Here's the question -

" **The propositional formulas in prefix notation (PN) are defined as follows:
• every atom is a PN formula
• if A is a PN formula then
¬A
is a PN formula
• for any binary boolean connective op, if A, B are PN formulas then
op A B
is a PN formula.
An example of a formula in PN notation is
¬ _ p q
which in infix notation is ¬(p _ q).
Prove that if two strings A and B are PN formulas and A is a prefix of B,
then A = B. **"

Thanks in advance! :)