What are the three types of proofs?

Related questions

1. When a mathematician writes QED at the end of a proof What does this mean?
2. What does ie stand for in text?
3. What does proof mean in math?
4. What is a blue pencil official?
5. What was to be shown?
6. Whats the full meaning of QED?
7. Why do we have to learn proofs?
8. What does IE mean?
9. What does QED mean in Outlander?
10. What does QEF stand for?

Tags

1. #proof
2. #negation
3. #major
4. #direct
5. #leads
6. #assumption
7. #there
8. #shown
9. #because
10. #types
11. #statement
12. #proofs
13. #contradiction
14. #indirect
15. #which