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Mirrors > Home > QLE Home > Th. List > ax-a2 | GIF version |
Description: Axiom for ortholattices. (Contributed by NM, 9-Aug-1997.) |
Ref | Expression |
---|---|
ax-a2 | (a ∪ b) = (b ∪ a) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | wva | . . 3 term a | |
2 | wvb | . . 3 term b | |
3 | 1, 2 | wo 6 | . 2 term (a ∪ b) |
4 | 2, 1 | wo 6 | . 2 term (b ∪ a) |
5 | 3, 4 | wb 1 | 1 wff (a ∪ b) = (b ∪ a) |
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