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Mirrors > Home > QLE Home > Th. List > 3tr2 | GIF version |
Description: Transitive inference useful for eliminating definitions. (Contributed by NM, 10-Aug-1997.) |
Ref | Expression |
---|---|
3tr2.1 | a = b |
3tr2.2 | a = c |
3tr2.3 | b = d |
Ref | Expression |
---|---|
3tr2 | c = d |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 3tr2.1 | . 2 a = b | |
2 | 3tr2.2 | . . 3 a = c | |
3 | 2 | ax-r1 35 | . 2 c = a |
4 | 3tr2.3 | . . 3 b = d | |
5 | 4 | ax-r1 35 | . 2 d = b |
6 | 1, 3, 5 | 3tr1 63 | 1 c = d |
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