Metamath Proof Explorer
Description: Deduction for elimination by cases. (Contributed by NM, 22-Apr-1994)
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Ref |
Expression |
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Hypotheses |
ecase23d.1 |
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|
ecase23d.2 |
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|
ecase23d.3 |
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Assertion |
ecase23d |
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Proof
Step |
Hyp |
Ref |
Expression |
1 |
|
ecase23d.1 |
|
2 |
|
ecase23d.2 |
|
3 |
|
ecase23d.3 |
|
4 |
|
ioran |
|
5 |
1 2 4
|
sylanbrc |
|
6 |
|
3orass |
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7 |
3 6
|
sylib |
|
8 |
7
|
ord |
|
9 |
5 8
|
mt3d |
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