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| Mirrors > Home > MPE Home > Th. List > in0 | Structured version Visualization version GIF version | ||
| Description: The intersection of a class with the empty set is the empty set. Dual of unv 4352. Commuted form of in0 4348. Theorem 16 of [Suppes] p. 26. (Contributed by NM, 21-Jun-1993.) |
| Ref | Expression |
|---|---|
| in0 | ⊢ (𝐴 ∩ ∅) = ∅ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | noel 4286 | . . . 4 ⊢ ¬ 𝑥 ∈ ∅ | |
| 2 | 1 | bianfi 543 | . . 3 ⊢ (𝑥 ∈ ∅ ↔ (𝑥 ∈ 𝐴 ∧ 𝑥 ∈ ∅)) |
| 3 | 2 | bicomi 227 | . 2 ⊢ ((𝑥 ∈ 𝐴 ∧ 𝑥 ∈ ∅) ↔ 𝑥 ∈ ∅) |
| 4 | 3 | ineqri 4112 | 1 ⊢ (𝐴 ∩ ∅) = ∅ |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∧ wa 401 = wceq 1570 ∈ wcel 2147 ∩ cin 4092 ∅c0 4281 |
| 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 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-ext 2735 |
| This proof depends on definitions: df-bi 210 df-an 402 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2102 df-clab 2742 df-cleq 2755 df-clel 2839 df-v 3456 df-dif 4050 df-in 4094 df-nul 4282 |
| This theorem is used by: 0in 4350 csbin 4403 res0 5990 dfpo2 6325 predprc 6367 fresaun 6783 oev2 8569 dju0en 10293 ackbij1lem13 10348 ackbij1lem16 10351 incexclem 16049 bitsinv1 16656 bitsinvp1 16663 sadcadd 16672 sadadd2 16674 sadid1 16682 bitsres 16687 smumullem 16706 ressbas 17458 sylow2a 19884 ablfac1eu 20340 indistopon 23374 fctop 23377 cctop 23379 rest0 23542 filconn 24257 volinun 25922 itg2cnlem2 26138 pthdlem2 30411 0pth 30773 1pthdlem2 30784 disjdifprg 33267 disjun0 33287 ofpreima2 33358 of0r 33370 ldgenpisyslem1 34907 0elcarsg 35050 carsgclctunlem1 35060 carsgclctunlem3 35063 ballotlemfval0 35239 sate0 36388 elima4 36755 bj-rest10 38279 bj-rest0 38284 mblfinlem2 38844 conrel1d 44924 conrel2d 44925 ntrk0kbimka 45300 clsneibex 45363 neicvgbex 45373 qinioo 46820 nnfoctbdjlem 47738 caragen0 47789 resinsnALT 50317 |
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