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Mirrors > Home > ILE Home > Th. List > elun1 | GIF version |
Description: Membership law for union of classes. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
elun1 | ⊢ (𝐴 ∈ 𝐵 → 𝐴 ∈ (𝐵 ∪ 𝐶)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ssun1 3234 | . 2 ⊢ 𝐵 ⊆ (𝐵 ∪ 𝐶) | |
2 | 1 | sseli 3088 | 1 ⊢ (𝐴 ∈ 𝐵 → 𝐴 ∈ (𝐵 ∪ 𝐶)) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∈ wcel 1480 ∪ cun 3064 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2119 |
This theorem depends on definitions: df-bi 116 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-v 2683 df-un 3070 df-in 3072 df-ss 3079 |
This theorem is referenced by: dcun 3468 exmidundif 4124 exmidundifim 4125 brtposg 6144 dftpos4 6153 dcdifsnid 6393 undifdcss 6804 fidcenumlemrks 6834 djulclr 6927 djulcl 6929 djuss 6948 finomni 7005 hashennnuni 10518 sumsplitdc 11194 srngbased 12071 srngplusgd 12072 srngmulrd 12073 lmodbased 12082 lmodplusgd 12083 lmodscad 12084 ipsbased 12090 ipsaddgd 12091 ipsmulrd 12092 |
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