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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 2733 |
| 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 2740 df-cleq 2753 df-clel 2836 df-v 3453 df-dif 3902 df-in 3906 df-nul 4280 |
| This theorem is used by: 0in 4347 csbin 4400 res0 5974 dfpo2 6298 predprc 6340 fresaun 6751 oev2 8524 dju0en 10247 ackbij1lem13 10302 ackbij1lem16 10305 incexclem 15998 bitsinv1 16605 bitsinvp1 16612 sadcadd 16621 sadadd2 16623 sadid1 16631 bitsres 16636 smumullem 16655 ressbas 17407 sylow2a 19826 ablfac1eu 20282 indistopon 23312 fctop 23315 cctop 23317 rest0 23480 filconn 24195 volinun 25860 itg2cnlem2 26076 pthdlem2 30347 0pth 30709 1pthdlem2 30720 disjdifprg 33162 disjun0 33182 ofpreima2 33253 of0r 33266 ldgenpisyslem1 34789 0elcarsg 34932 carsgclctunlem1 34942 carsgclctunlem3 34945 ballotlemfval0 35121 sate0 36159 elima4 36520 bj-rest10 37989 bj-rest0 37994 mblfinlem2 38556 conrel1d 44648 conrel2d 44649 ntrk0kbimka 45024 clsneibex 45087 neicvgbex 45097 qinioo 46516 nnfoctbdjlem 47434 caragen0 47485 resinsnALT 49950 |
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