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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 4356. Commuted form of in0 4352. Theorem 16 of [Suppes] p. 26. (Contributed by NM, 21-Jun-1993.) |
| Ref | Expression |
|---|---|
| in0 | ⊢ (𝐴 ∩ ∅) = ∅ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | noel 4291 | . . . 4 ⊢ ¬ 𝑥 ∈ ∅ | |
| 2 | 1 | bianfi 543 | . . 3 ⊢ (𝑥 ∈ ∅ ↔ (𝑥 ∈ 𝐴 ∧ 𝑥 ∈ ∅)) |
| 3 | 2 | bicomi 227 | . 2 ⊢ ((𝑥 ∈ 𝐴 ∧ 𝑥 ∈ ∅) ↔ 𝑥 ∈ ∅) |
| 4 | 3 | ineqri 4165 | 1 ⊢ (𝐴 ∩ ∅) = ∅ |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∧ wa 401 = wceq 1570 ∈ wcel 2146 ∩ cin 3905 ∅c0 4286 |
| 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 2148 ax-9 2156 ax-ext 2737 |
| This proof depends on definitions: df-bi 210 df-an 402 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2100 df-clab 2744 df-cleq 2757 df-clel 2840 df-v 3459 df-dif 3909 df-in 3913 df-nul 4287 |
| This theorem is used by: 0in 4354 csbin 4407 res0 5984 dfpo2 6301 predprc 6343 fresaun 6753 oev2 8510 dju0en 10171 ackbij1lem13 10226 ackbij1lem16 10229 incexclem 15908 bitsinv1 16517 bitsinvp1 16524 sadcadd 16533 sadadd2 16535 sadid1 16543 bitsres 16548 smumullem 16567 ressbas 17313 sylow2a 19712 ablfac1eu 20168 indistopon 23187 fctop 23190 cctop 23192 rest0 23355 filconn 24069 volinun 25734 itg2cnlem2 25950 pthdlem2 30146 0pth 30505 1pthdlem2 30516 disjdifprg 32949 disjun0 32969 ofpreima2 33040 of0r 33053 ldgenpisyslem1 34577 0elcarsg 34721 carsgclctunlem1 34731 carsgclctunlem3 34734 ballotlemfval0 34910 sate0 35920 elima4 36281 bj-rest10 37763 bj-rest0 37768 mblfinlem2 38342 conrel1d 44422 conrel2d 44423 ntrk0kbimka 44798 clsneibex 44861 neicvgbex 44871 qinioo 46284 nnfoctbdjlem 47202 caragen0 47253 resinsnALT 49684 |
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