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Mirrors > Home > ILE Home > Th. List > abbidv | Unicode version |
Description: Equivalent wff's yield equal class abstractions (deduction form). (Contributed by NM, 10-Aug-1993.) |
Ref | Expression |
---|---|
abbidv.1 |
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Ref | Expression |
---|---|
abbidv |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfv 1528 |
. 2
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2 | abbidv.1 |
. 2
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3 | 1, 2 | abbid 2294 |
1
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