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Mirrors > Home > QLE Home > Th. List > lor | GIF version |
Description: Inference introducing disjunct to left. (Contributed by NM, 10-Aug-1997.) |
Ref | Expression |
---|---|
lor.1 | a = b |
Ref | Expression |
---|---|
lor | (c ∪ a) = (c ∪ b) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | lor.1 | . . 3 a = b | |
2 | 1 | ax-r5 38 | . 2 (a ∪ c) = (b ∪ c) |
3 | ax-a2 31 | . 2 (c ∪ a) = (a ∪ c) | |
4 | ax-a2 31 | . 2 (c ∪ b) = (b ∪ c) | |
5 | 2, 3, 4 | 3tr1 63 | 1 (c ∪ a) = (c ∪ b) |
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