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Mirrors > Home > MPE Home > Th. List > Mathboxes > bj-ismoored2 | Structured version Visualization version GIF version |
Description: Necessary condition to be a Moore collection. (Contributed by BJ, 9-Dec-2021.) |
Ref | Expression |
---|---|
bj-ismoored.1 | ⊢ (𝜑 → 𝐴 ∈ Moore) |
bj-ismoored.2 | ⊢ (𝜑 → 𝐵 ⊆ 𝐴) |
bj-ismoored2.3 | ⊢ (𝜑 → 𝐵 ≠ ∅) |
Ref | Expression |
---|---|
bj-ismoored2 | ⊢ (𝜑 → ∩ 𝐵 ∈ 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bj-ismoored.2 | . . . 4 ⊢ (𝜑 → 𝐵 ⊆ 𝐴) | |
2 | bj-ismoored2.3 | . . . 4 ⊢ (𝜑 → 𝐵 ≠ ∅) | |
3 | intssuni2 4901 | . . . 4 ⊢ ((𝐵 ⊆ 𝐴 ∧ 𝐵 ≠ ∅) → ∩ 𝐵 ⊆ ∪ 𝐴) | |
4 | 1, 2, 3 | syl2anc 586 | . . 3 ⊢ (𝜑 → ∩ 𝐵 ⊆ ∪ 𝐴) |
5 | sseqin2 4192 | . . 3 ⊢ (∩ 𝐵 ⊆ ∪ 𝐴 ↔ (∪ 𝐴 ∩ ∩ 𝐵) = ∩ 𝐵) | |
6 | 4, 5 | sylib 220 | . 2 ⊢ (𝜑 → (∪ 𝐴 ∩ ∩ 𝐵) = ∩ 𝐵) |
7 | bj-ismoored.1 | . . 3 ⊢ (𝜑 → 𝐴 ∈ Moore) | |
8 | 7, 1 | bj-ismoored 34402 | . 2 ⊢ (𝜑 → (∪ 𝐴 ∩ ∩ 𝐵) ∈ 𝐴) |
9 | 6, 8 | eqeltrrd 2914 | 1 ⊢ (𝜑 → ∩ 𝐵 ∈ 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1537 ∈ wcel 2114 ≠ wne 3016 ∩ cin 3935 ⊆ wss 3936 ∅c0 4291 ∪ cuni 4838 ∩ cint 4876 Moorecmoore 34398 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 ax-sep 5203 ax-nul 5210 ax-pow 5266 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-ral 3143 df-rex 3144 df-rab 3147 df-v 3496 df-dif 3939 df-in 3943 df-ss 3952 df-nul 4292 df-pw 4541 df-uni 4839 df-int 4877 df-bj-moore 34399 |
This theorem is referenced by: (None) |
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