LOGIC SYMBOL

2. - Represents a statement that is always true.
5. – Semantic entailment; a formula logically follows from another.
6. – Symbol for the set of integers.
7. - If the first is true, then the second is true. NATURALS – Symbol for the set of natural numbers.
9. - It is not the case that
11. – Another notation for logical implication.
13. – Set of elements common to two sets.
14. – Set of elements belonging to at least one of two sets

1. - Represents a statement that is always false.
3. - Used to denote a conclusion derived from premises.
4. - At least one is true
8. - Denotes syntactic entailment; indicates that a statement can be derived from a set of axioms.
10. - Both are true
12. – Always true proposition.