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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 |
Ref | Expression |
---|---|
abbidv |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfv 1516 | . 2 | |
2 | abbidv.1 | . 2 | |
3 | 1, 2 | abbid 2283 | 1 |
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