Metamath Proof Explorer
Description: First-order logic and set theory. (Contributed by Jonathan Ben-Naim, 3-Jun-2011) (New usage is discouraged.)
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Ref |
Expression |
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Hypotheses |
bnj1101.1 |
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|
bnj1101.2 |
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Assertion |
bnj1101 |
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Proof
Step |
Hyp |
Ref |
Expression |
1 |
|
bnj1101.1 |
|
2 |
|
bnj1101.2 |
|
3 |
|
pm3.42 |
|
4 |
1 3
|
bnj101 |
|
5 |
2
|
pm4.71i |
|
6 |
5
|
imbi1i |
|
7 |
6
|
exbii |
|
8 |
4 7
|
mpbir |
|