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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 4349. Commuted form of in0 4345. Theorem 16 of [Suppes] p. 26. (Contributed by NM, 21-Jun-1993.) |
| Ref | Expression |
|---|---|
| in0 | ⊢ (𝐴 ∩ ∅) = ∅ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | noel 4284 | . . . 4 ⊢ ¬ 𝑥 ∈ ∅ | |
| 2 | 1 | bianfi 543 | . . 3 ⊢ (𝑥 ∈ ∅ ↔ (𝑥 ∈ 𝐴 ∧ 𝑥 ∈ ∅)) |
| 3 | 2 | bicomi 227 | . 2 ⊢ ((𝑥 ∈ 𝐴 ∧ 𝑥 ∈ ∅) ↔ 𝑥 ∈ ∅) |
| 4 | 3 | ineqri 4158 | 1 ⊢ (𝐴 ∩ ∅) = ∅ |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∧ wa 401 = wceq 1570 ∈ wcel 2145 ∩ cin 3898 ∅c0 4279 |
| 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-ext 2732 |
| 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 2739 df-cleq 2752 df-clel 2835 df-v 3452 df-dif 3902 df-in 3906 df-nul 4280 |
| This theorem is used by: 0in 4347 csbin 4400 res0 5976 dfpo2 6294 predprc 6336 fresaun 6746 oev2 8510 dju0en 10178 ackbij1lem13 10233 ackbij1lem16 10236 incexclem 15925 bitsinv1 16532 bitsinvp1 16539 sadcadd 16548 sadadd2 16550 sadid1 16558 bitsres 16563 smumullem 16582 ressbas 17328 sylow2a 19746 ablfac1eu 20202 indistopon 23226 fctop 23229 cctop 23231 rest0 23394 filconn 24109 volinun 25774 itg2cnlem2 25990 pthdlem2 30233 0pth 30595 1pthdlem2 30606 disjdifprg 33048 disjun0 33068 ofpreima2 33139 of0r 33152 ldgenpisyslem1 34674 0elcarsg 34818 carsgclctunlem1 34828 carsgclctunlem3 34831 ballotlemfval0 35007 sate0 35994 elima4 36355 bj-rest10 37838 bj-rest0 37843 mblfinlem2 38407 conrel1d 44503 conrel2d 44504 ntrk0kbimka 44879 clsneibex 44942 neicvgbex 44952 qinioo 46365 nnfoctbdjlem 47283 caragen0 47334 resinsnALT 49799 |
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