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Mirrors > Home > QLE Home > Th. List > lan | GIF version |
Description: Introduce conjunct on left. (Contributed by NM, 10-Aug-1997.) |
Ref | Expression |
---|---|
lan.1 | a = b |
Ref | Expression |
---|---|
lan | (c ∩ a) = (c ∩ b) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | lan.1 | . . . . 5 a = b | |
2 | 1 | ax-r4 37 | . . . 4 a⊥ = b⊥ |
3 | 2 | lor 70 | . . 3 (c⊥ ∪ a⊥ ) = (c⊥ ∪ b⊥ ) |
4 | 3 | ax-r4 37 | . 2 (c⊥ ∪ a⊥ )⊥ = (c⊥ ∪ b⊥ )⊥ |
5 | df-a 40 | . 2 (c ∩ a) = (c⊥ ∪ a⊥ )⊥ | |
6 | df-a 40 | . 2 (c ∩ b) = (c⊥ ∪ b⊥ )⊥ | |
7 | 4, 5, 6 | 3tr1 63 | 1 (c ∩ a) = (c ∩ b) |
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