I have a page in FB . What are the benefits that I can get ?
Predicate Logic : and vs implies . What 's the difference between statements like -LRB- ∃ x -RRB- -LRB- Dx & ~ Ox -RRB- and -LRB- ∃ x -RRB- -LRB- Dx ⊃ ~ Ox -RRB- ?