LOGIC SYMBOL

3. – Semantic entailment; a formula logically follows from another.
5. – Set of elements common to two sets.
9. – Another notation for logical implication.
11. - Denotes syntactic entailment; indicates that a statement can be derived from a set of axioms.
13. – Always true proposition.
14. – Set of elements belonging to at least one of two sets

1. - Represents a statement that is always false.
2. - At least one is true
4. - If the first is true, then the second is true. NATURALS – Symbol for the set of natural numbers.
6. - Used to denote a conclusion derived from premises.
7. - It is not the case that
8. - Both are true
10. – Symbol for the set of integers.
12. - Represents a statement that is always true.