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| Mirrors > Home > MPE Home > Th. List > Mathboxes > disjeq | Structured version Visualization version GIF version | ||
| Description: Equality theorem for disjoints. (Contributed by Peter Mazsa, 22-Sep-2021.) |
| Ref | Expression |
|---|---|
| disjeq | ⊢ (𝐴 = 𝐵 → ( Disj 𝐴 ↔ Disj 𝐵)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqimss2 3994 | . . 3 ⊢ (𝐴 = 𝐵 → 𝐵 ⊆ 𝐴) | |
| 2 | 1 | disjssd 39036 | . 2 ⊢ (𝐴 = 𝐵 → ( Disj 𝐴 → Disj 𝐵)) |
| 3 | eqimss 3993 | . . 3 ⊢ (𝐴 = 𝐵 → 𝐴 ⊆ 𝐵) | |
| 4 | 3 | disjssd 39036 | . 2 ⊢ (𝐴 = 𝐵 → ( Disj 𝐵 → Disj 𝐴)) |
| 5 | 2, 4 | impbid 212 | 1 ⊢ (𝐴 = 𝐵 → ( Disj 𝐴 ↔ Disj 𝐵)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 = wceq 1542 Disj wdisjALTV 38422 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-11 2163 ax-ext 2709 ax-sep 5242 ax-nul 5252 ax-pr 5378 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-sb 2069 df-clab 2716 df-cleq 2729 df-clel 2812 df-ral 3053 df-rex 3062 df-rab 3401 df-v 3443 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-nul 4287 df-if 4481 df-sn 4582 df-pr 4584 df-op 4588 df-br 5100 df-opab 5162 df-id 5520 df-xp 5631 df-rel 5632 df-cnv 5633 df-co 5634 df-dm 5635 df-rn 5636 df-res 5637 df-coss 38704 df-cnvrefrel 38810 df-funALTV 38970 df-disjALTV 38993 |
| This theorem is referenced by: disjeqi 39038 disjeqd 39039 disjdmqseqeq1 39040 |
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