What is difference between Lemma and Theorem?

Related questions

1. Are the rationals well ordered?
2. What is an ordering principle in English?
3. What is an ordering principle?
4. What is a true axiom?
5. Does axiom require proof?
6. What is total order set?
7. What is an example of a corollary?
8. Can postulates be used in proofs?
9. What is the difference between induction and strong induction?
10. Does the universal set contain itself?

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2. #important
3. #theorem
4. #purpose
5. #whose
6. #logical
7. #between
8. #waiting
9. #corollary
10. #proposition
11. #proving
12. #claims
13. #lemma
14. #reserved
15. #result
16. #often
17. #proved
18. #there
19. #results
20. #mathematical
21. #difference
22. #paper
23. #minor