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Mirrors > Home > QLE Home > Th. List > bltr | GIF version |
Description: Transitive inference. (Contributed by NM, 28-Aug-1997.) |
Ref | Expression |
---|---|
bltr.1 | a = b |
bltr.2 | b ≤ c |
Ref | Expression |
---|---|
bltr | a ≤ c |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bltr.1 | . . . 4 a = b | |
2 | 1 | ax-r5 38 | . . 3 (a ∪ c) = (b ∪ c) |
3 | bltr.2 | . . . 4 b ≤ c | |
4 | 3 | df-le2 131 | . . 3 (b ∪ c) = c |
5 | 2, 4 | ax-r2 36 | . 2 (a ∪ c) = c |
6 | 5 | df-le1 130 | 1 a ≤ c |
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