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Mirrors > Home > QLE Home > Th. List > 3tr1 | GIF version |
Description: Transitive inference useful for introducing definitions. (Contributed by NM, 10-Aug-1997.) |
Ref | Expression |
---|---|
3tr1.1 | a = b |
3tr1.2 | c = a |
3tr1.3 | d = b |
Ref | Expression |
---|---|
3tr1 | c = d |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 3tr1.2 | . 2 c = a | |
2 | 3tr1.1 | . . 3 a = b | |
3 | 3tr1.3 | . . . 4 d = b | |
4 | 3 | ax-r1 35 | . . 3 b = d |
5 | 2, 4 | ax-r2 36 | . 2 a = d |
6 | 1, 5 | ax-r2 36 | 1 c = d |
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