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| Mirrors > Home > ILE Home > Th. List > Mathboxes > bj-intexr | GIF version | ||
| Description: intexr 4284 from bounded separation. (Contributed by BJ, 18-Nov-2019.) (Proof modification is discouraged.) |
| Ref | Expression |
|---|---|
| bj-intexr | ⊢ (∩ 𝐴 ∈ V → 𝐴 ≠ ∅) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | bj-vprc 16905 | . . 3 ⊢ ¬ V ∈ V | |
| 2 | inteq 3971 | . . . . 5 ⊢ (𝐴 = ∅ → ∩ 𝐴 = ∩ ∅) | |
| 3 | int0 3982 | . . . . 5 ⊢ ∩ ∅ = V | |
| 4 | 2, 3 | eqtrdi 2287 | . . . 4 ⊢ (𝐴 = ∅ → ∩ 𝐴 = V) |
| 5 | 4 | eleq1d 2307 | . . 3 ⊢ (𝐴 = ∅ → (∩ 𝐴 ∈ V ↔ V ∈ V)) |
| 6 | 1, 5 | mtbiri 686 | . 2 ⊢ (𝐴 = ∅ → ¬ ∩ 𝐴 ∈ V) |
| 7 | 6 | necon2ai 2474 | 1 ⊢ (∩ 𝐴 ∈ V → 𝐴 ≠ ∅) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 = wceq 1402 ∈ wcel 2209 ≠ wne 2420 Vcvv 2821 ∅c0 3520 ∩ cint 3968 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-13 2211 ax-14 2212 ax-ext 2220 ax-bdn 16826 ax-bdel 16830 ax-bdsep 16893 |
| This theorem depends on definitions: df-bi 117 df-tru 1405 df-fal 1408 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ne 2421 df-ral 2533 df-v 2823 df-dif 3222 df-nul 3521 df-int 3969 |
| This theorem is referenced by: (None) |
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