Metamath Proof Explorer
Description: .~ is a relation. (Contributed by Alexander van der Vekens, 25-Mar-2018) (Revised by AV, 30-Apr-2021)
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Ref |
Expression |
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Hypotheses |
erclwwlkn.w |
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erclwwlkn.r |
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Assertion |
erclwwlknrel |
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Proof
Step |
Hyp |
Ref |
Expression |
1 |
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erclwwlkn.w |
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2 |
|
erclwwlkn.r |
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3 |
2
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relopabi |
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