Description: Inference for elimination by cases. (Contributed by NM, 23-Mar-1995) (Proof shortened by Wolf Lammen, 26-Nov-2012)
Ref | Expression | ||
---|---|---|---|
Hypotheses | ecase3.1 | |
|
ecase3.2 | |
||
ecase3.3 | |
||
Assertion | ecase3 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ecase3.1 | |
|
2 | ecase3.2 | |
|
3 | ecase3.3 | |
|
4 | 1 2 | jaoi | |
5 | 4 3 | pm2.61i | |