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Mirrors > Home > ILE Home > Th. List > elun2 | GIF version |
Description: Membership law for union of classes. (Contributed by NM, 30-Aug-1993.) |
Ref | Expression |
---|---|
elun2 | ⊢ (𝐴 ∈ 𝐵 → 𝐴 ∈ (𝐶 ∪ 𝐵)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ssun2 3245 | . 2 ⊢ 𝐵 ⊆ (𝐶 ∪ 𝐵) | |
2 | 1 | sseli 3098 | 1 ⊢ (𝐴 ∈ 𝐵 → 𝐴 ∈ (𝐶 ∪ 𝐵)) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∈ wcel 1481 ∪ cun 3074 |
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 699 ax-5 1424 ax-7 1425 ax-gen 1426 ax-ie1 1470 ax-ie2 1471 ax-8 1483 ax-10 1484 ax-11 1485 ax-i12 1486 ax-bndl 1487 ax-4 1488 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 |
This theorem depends on definitions: df-bi 116 df-tru 1335 df-nf 1438 df-sb 1737 df-clab 2127 df-cleq 2133 df-clel 2136 df-nfc 2271 df-v 2691 df-un 3080 df-in 3082 df-ss 3089 |
This theorem is referenced by: dcun 3478 exmidundif 4137 exmidundifim 4138 dftpos4 6168 tfrlemibxssdm 6232 tfrlemi14d 6238 tfr1onlembxssdm 6248 tfr1onlemres 6254 tfrcllembxssdm 6261 tfrcllemres 6267 dcdifsnid 6408 findcard2d 6793 findcard2sd 6794 onunsnss 6813 undifdcss 6819 fisseneq 6828 fidcenumlemrks 6849 djurclr 6943 djurcl 6945 djuss 6963 finomni 7020 mnfxr 7846 hashinfuni 10555 fsumsplitsnun 11220 sumsplitdc 11233 modfsummodlem1 11257 exmidunben 11975 srnginvld 12124 lmodvscad 12135 ipsscad 12143 ipsvscad 12144 ipsipd 12145 |
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