Can postulates be used in proofs?

Related questions

1. Can a set be an element of itself?
2. Are the reals well ordered?
3. What is axiomatic set theory?
4. Does the universal set contain itself?
5. How do you prove well ordering principle?
6. What does it mean for a set to be well ordered?
7. Does null set contain itself?
8. Why is the axiom of choice an axiom?
9. What is an ordering principle in English?
10. What are the examples of set?

Tags

1. #trigonometry
2. #deduction
3. #statements
4. #axioms
5. #propositions
6. #system
7. #prove
8. #proof
9. #theorems
10. #proofs
11. #algebra
12. #postulates
13. #known
14. #mathematical
15. #building
16. #geometry
17. #blocks