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Mirrors > Home > QLE Home > Th. List > 2or | GIF version |
Description: Join both sides with disjunction. (Contributed by NM, 10-Aug-1997.) |
Ref | Expression |
---|---|
2or.1 | a = b |
2or.2 | c = d |
Ref | Expression |
---|---|
2or | (a ∪ c) = (b ∪ d) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 2or.2 | . . 3 c = d | |
2 | 1 | lor 70 | . 2 (a ∪ c) = (a ∪ d) |
3 | 2or.1 | . . 3 a = b | |
4 | 3 | ax-r5 38 | . 2 (a ∪ d) = (b ∪ d) |
5 | 2, 4 | ax-r2 36 | 1 (a ∪ c) = (b ∪ d) |
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