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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 4357. Commuted form of in0 4353. Theorem 16 of [Suppes] p. 26. (Contributed by NM, 21-Jun-1993.) |
| Ref | Expression |
|---|---|
| in0 | ⊢ (𝐴 ∩ ∅) = ∅ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | noel 4292 | . . . 4 ⊢ ¬ 𝑥 ∈ ∅ | |
| 2 | 1 | bianfi 542 | . . 3 ⊢ (𝑥 ∈ ∅ ↔ (𝑥 ∈ 𝐴 ∧ 𝑥 ∈ ∅)) |
| 3 | 2 | bicomi 227 | . 2 ⊢ ((𝑥 ∈ 𝐴 ∧ 𝑥 ∈ ∅) ↔ 𝑥 ∈ ∅) |
| 4 | 3 | ineqri 4166 | 1 ⊢ (𝐴 ∩ ∅) = ∅ |
| Colors of variables: wff setvar class |
| Syntax hints: ∧ wa 400 = wceq 1570 ∈ wcel 2143 ∩ cin 3905 ∅c0 4287 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1825 ax-4 1839 ax-5 1940 ax-6 1997 ax-7 2038 ax-8 2145 ax-9 2153 ax-ext 2735 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-tru 1573 df-fal 1583 df-ex 1810 df-sb 2097 df-clab 2742 df-cleq 2755 df-clel 2838 df-v 3457 df-dif 3909 df-in 3913 df-nul 4288 |
| This theorem is referenced by: 0in 4355 csbin 4408 res0 5984 dfpo2 6299 predprc 6341 fresaun 6751 oev2 8509 dju0en 10160 ackbij1lem13 10215 ackbij1lem16 10218 incexclem 15892 bitsinv1 16501 bitsinvp1 16508 sadcadd 16517 sadadd2 16519 sadid1 16527 bitsres 16532 smumullem 16551 ressbas 17297 sylow2a 19690 ablfac1eu 20146 indistopon 23139 fctop 23142 cctop 23144 rest0 23307 filconn 24021 volinun 25686 itg2cnlem2 25902 pthdlem2 30098 0pth 30457 1pthdlem2 30468 disjdifprg 32901 disjun0 32921 ofpreima2 32992 of0r 33005 ldgenpisyslem1 34534 0elcarsg 34678 carsgclctunlem1 34688 carsgclctunlem3 34691 ballotlemfval0 34867 sate0 35888 elima4 36249 bj-rest10 37711 bj-rest0 37716 mblfinlem2 38290 conrel1d 44372 conrel2d 44373 ntrk0kbimka 44748 clsneibex 44811 neicvgbex 44821 qinioo 46234 nnfoctbdjlem 47152 caragen0 47203 resinsnALT 49634 |
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