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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 4348. Commuted form of in0 4344. Theorem 16 of [Suppes] p. 26. (Contributed by NM, 21-Jun-1993.) |
| Ref | Expression |
|---|---|
| in0 | ⊢ (𝐴 ∩ ∅) = ∅ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | noel 4283 | . . . 4 ⊢ ¬ 𝑥 ∈ ∅ | |
| 2 | 1 | bianfi 543 | . . 3 ⊢ (𝑥 ∈ ∅ ↔ (𝑥 ∈ 𝐴 ∧ 𝑥 ∈ ∅)) |
| 3 | 2 | bicomi 227 | . 2 ⊢ ((𝑥 ∈ 𝐴 ∧ 𝑥 ∈ ∅) ↔ 𝑥 ∈ ∅) |
| 4 | 3 | ineqri 4109 | 1 ⊢ (𝐴 ∩ ∅) = ∅ |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∧ wa 401 = wceq 1569 ∈ wcel 2144 ∩ cin 4089 ∅c0 4278 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-ext 2732 |
| This proof depends on definitions: df-bi 210 df-an 402 df-tru 1572 df-fal 1582 df-ex 1812 df-sb 2099 df-clab 2739 df-cleq 2752 df-clel 2835 df-v 3452 df-dif 4047 df-in 4091 df-nul 4279 |
| This theorem is used by: 0in 4346 csbin 4399 res0 5973 dfpo2 6299 predprc 6341 fresaun 6754 oev2 8535 dju0en 10258 ackbij1lem13 10313 ackbij1lem16 10316 incexclem 16011 bitsinv1 16618 bitsinvp1 16625 sadcadd 16634 sadadd2 16636 sadid1 16644 bitsres 16649 smumullem 16668 ressbas 17420 sylow2a 19839 ablfac1eu 20295 indistopon 23325 fctop 23328 cctop 23330 rest0 23493 filconn 24208 volinun 25873 itg2cnlem2 26089 pthdlem2 30360 0pth 30722 1pthdlem2 30733 disjdifprg 33217 disjun0 33237 ofpreima2 33308 of0r 33321 ldgenpisyslem1 34843 0elcarsg 34986 carsgclctunlem1 34996 carsgclctunlem3 34999 ballotlemfval0 35175 sate0 36267 elima4 36633 bj-rest10 38102 bj-rest0 38107 mblfinlem2 38670 conrel1d 44757 conrel2d 44758 ntrk0kbimka 45133 clsneibex 45196 neicvgbex 45206 qinioo 46641 nnfoctbdjlem 47559 caragen0 47610 resinsnALT 50080 |
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