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Mirrors > Home > QLE Home > Th. List > ax-r5 | GIF version |
Description: Inference rule for ortholattices. (Contributed by NM, 9-Aug-1997.) |
Ref | Expression |
---|---|
r5.1 | a = b |
Ref | Expression |
---|---|
ax-r5 | (a ∪ c) = (b ∪ c) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | wva | . . 3 term a | |
2 | wvc | . . 3 term c | |
3 | 1, 2 | wo 6 | . 2 term (a ∪ c) |
4 | wvb | . . 3 term b | |
5 | 4, 2 | wo 6 | . 2 term (b ∪ c) |
6 | 3, 5 | wb 1 | 1 wff (a ∪ c) = (b ∪ c) |
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