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Mirrors > Home > QLE Home > Th. List > ax-a3 | GIF version |
Description: Axiom for ortholattices. (Contributed by NM, 9-Aug-1997.) |
Ref | Expression |
---|---|
ax-a3 | ((a ∪ b) ∪ c) = (a ∪ (b ∪ c)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | wva | . . . 4 term a | |
2 | wvb | . . . 4 term b | |
3 | 1, 2 | wo 6 | . . 3 term (a ∪ b) |
4 | wvc | . . 3 term c | |
5 | 3, 4 | wo 6 | . 2 term ((a ∪ b) ∪ c) |
6 | 2, 4 | wo 6 | . . 3 term (b ∪ c) |
7 | 1, 6 | wo 6 | . 2 term (a ∪ (b ∪ c)) |
8 | 5, 7 | wb 1 | 1 wff ((a ∪ b) ∪ c) = (a ∪ (b ∪ c)) |
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