Question
~ (p & q) ↔ (~ p v ~ q)

Answer

Truth table:
  1 2 3 4 5 6 7 8
p q ~ p ~ q p & q ~ (p & q) ~ p v ~ q ~ (p & q) $\leftrightarrow$ (~ p v ~ q)
1 T T F F T F F T
2 T F F T F T T T
3 F T T F F T T T
4 F F T T F T T T
  1 (~) 2(~) 1, 2 (&) 5 (~ ) 3, 4 (V) 6, 7 ($\leftrightarrow$)
Decision of the type of form for the statement: Looking at the truth table above, it will be seen that the representation of the given form for the statement is in the column. 8. All rows in this column have the same ‘T’. This means that all substitutions for this form of statement are true. So it is clear that this form of statement is 'tadevarthaka'.

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