| Mathbox for BJ |
< Previous
Next >
Nearby theorems |
||
| Mirrors > Home > ILE Home > Th. List > Mathboxes > bj-intexr | GIF version | ||
| Description: intexr 4245 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 16592 | . . 3 ⊢ ¬ V ∈ V | |
| 2 | inteq 3936 | . . . . 5 ⊢ (𝐴 = ∅ → ∩ 𝐴 = ∩ ∅) | |
| 3 | int0 3947 | . . . . 5 ⊢ ∩ ∅ = V | |
| 4 | 2, 3 | eqtrdi 2280 | . . . 4 ⊢ (𝐴 = ∅ → ∩ 𝐴 = V) |
| 5 | 4 | eleq1d 2300 | . . 3 ⊢ (𝐴 = ∅ → (∩ 𝐴 ∈ V ↔ V ∈ V)) |
| 6 | 1, 5 | mtbiri 682 | . 2 ⊢ (𝐴 = ∅ → ¬ ∩ 𝐴 ∈ V) |
| 7 | 6 | necon2ai 2457 | 1 ⊢ (∩ 𝐴 ∈ V → 𝐴 ≠ ∅) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 = wceq 1398 ∈ wcel 2202 ≠ wne 2403 Vcvv 2803 ∅c0 3496 ∩ cint 3933 |
| 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 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2204 ax-14 2205 ax-ext 2213 ax-bdn 16513 ax-bdel 16517 ax-bdsep 16580 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2364 df-ne 2404 df-ral 2516 df-v 2805 df-dif 3203 df-nul 3497 df-int 3934 |
| This theorem is referenced by: (None) |
| Copyright terms: Public domain | W3C validator |