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| Mirrors > Home > MPE Home > Th. List > mreincl | Structured version Visualization version GIF version | ||
| Description: Two closed sets have a closed intersection. (Contributed by Stefan O'Rear, 30-Jan-2015.) |
| Ref | Expression |
|---|---|
| mreincl | ⊢ ((𝐶 ∈ (Moore‘𝑋) ∧ 𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐶) → (𝐴 ∩ 𝐵) ∈ 𝐶) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | intprg 4944 | . . 3 ⊢ ((𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐶) → ∩ {𝐴, 𝐵} = (𝐴 ∩ 𝐵)) | |
| 2 | 1 | 3adant1 1148 | . 2 ⊢ ((𝐶 ∈ (Moore‘𝑋) ∧ 𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐶) → ∩ {𝐴, 𝐵} = (𝐴 ∩ 𝐵)) |
| 3 | simp1 1154 | . . 3 ⊢ ((𝐶 ∈ (Moore‘𝑋) ∧ 𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐶) → 𝐶 ∈ (Moore‘𝑋)) | |
| 4 | prssi 4785 | . . . 4 ⊢ ((𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐶) → {𝐴, 𝐵} ⊆ 𝐶) | |
| 5 | 4 | 3adant1 1148 | . . 3 ⊢ ((𝐶 ∈ (Moore‘𝑋) ∧ 𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐶) → {𝐴, 𝐵} ⊆ 𝐶) |
| 6 | prnzg 4742 | . . . 4 ⊢ (𝐴 ∈ 𝐶 → {𝐴, 𝐵} ≠ ∅) | |
| 7 | 6 | 3ad2ant2 1152 | . . 3 ⊢ ((𝐶 ∈ (Moore‘𝑋) ∧ 𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐶) → {𝐴, 𝐵} ≠ ∅) |
| 8 | mreintcl 17683 | . . 3 ⊢ ((𝐶 ∈ (Moore‘𝑋) ∧ {𝐴, 𝐵} ⊆ 𝐶 ∧ {𝐴, 𝐵} ≠ ∅) → ∩ {𝐴, 𝐵} ∈ 𝐶) | |
| 9 | 3, 5, 7, 8 | syl3anc 1398 | . 2 ⊢ ((𝐶 ∈ (Moore‘𝑋) ∧ 𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐶) → ∩ {𝐴, 𝐵} ∈ 𝐶) |
| 10 | 2, 9 | eqeltrrd 2863 | 1 ⊢ ((𝐶 ∈ (Moore‘𝑋) ∧ 𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐶) → (𝐴 ∩ 𝐵) ∈ 𝐶) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ w3a 1103 = wceq 1570 ∈ wcel 2145 ≠ wne 2957 ∩ cin 3901 ⊆ wss 3902 ∅c0 4282 {cpr 4589 ∩ cint 4910 ‘cfv 6537 Moorecmre 17670 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2215 ax-ext 2734 ax-sep 5255 ax-nul 5267 ax-pow 5334 ax-pr 5402 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-ral 3079 df-rex 3089 df-rab 3415 df-v 3455 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-nul 4283 df-if 4486 df-pw 4562 df-sn 4588 df-pr 4590 df-op 4594 df-uni 4871 df-int 4911 df-br 5108 df-opab 5172 df-mpt 5191 df-id 5554 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-iota 6493 df-fun 6539 df-fv 6545 df-mre 17674 |
| This theorem is used by: submacs 18937 subgacs 19285 nsgacs 19286 lsmmod 19803 subrgacs 20967 sdrgacs 20968 lssacs 21152 mreclatdemoBAD 23322 lidlincl 33845 |
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