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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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