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Mirrors > Home > MPE Home > Th. List > ssequn2 | Structured version Visualization version GIF version |
Description: A relationship between subclass and union. (Contributed by NM, 13-Jun-1994.) |
Ref | Expression |
---|---|
ssequn2 | ⊢ (𝐴 ⊆ 𝐵 ↔ (𝐵 ∪ 𝐴) = 𝐵) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ssequn1 3783 | . 2 ⊢ (𝐴 ⊆ 𝐵 ↔ (𝐴 ∪ 𝐵) = 𝐵) | |
2 | uncom 3757 | . . 3 ⊢ (𝐴 ∪ 𝐵) = (𝐵 ∪ 𝐴) | |
3 | 2 | eqeq1i 2627 | . 2 ⊢ ((𝐴 ∪ 𝐵) = 𝐵 ↔ (𝐵 ∪ 𝐴) = 𝐵) |
4 | 1, 3 | bitri 264 | 1 ⊢ (𝐴 ⊆ 𝐵 ↔ (𝐵 ∪ 𝐴) = 𝐵) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 196 = wceq 1483 ∪ cun 3572 ⊆ wss 3574 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-v 3202 df-un 3579 df-in 3581 df-ss 3588 |
This theorem is referenced by: unabs 3854 tppreqb 4336 pwssun 5020 pwundif 5021 relresfld 5662 ordssun 5827 ordequn 5828 oneluni 5840 fsnunf 6451 sorpssun 6944 ordunpr 7026 fodomr 8111 enp1ilem 8194 pwfilem 8260 brwdom2 8478 sucprcreg 8506 dfacfin7 9221 hashbclem 13236 incexclem 14568 ramub1lem1 15730 ramub1lem2 15731 mreexmrid 16303 lspun0 19011 lbsextlem4 19161 cldlp 20954 ordtuni 20994 lfinun 21328 cldsubg 21914 trust 22033 nulmbl2 23304 limcmpt2 23648 cnplimc 23651 dvreslem 23673 dvaddbr 23701 dvmulbr 23702 lhop 23779 plypf1 23968 coeeulem 23980 coeeu 23981 coef2 23987 rlimcnp 24692 ex-un 27281 shs0i 28308 chj0i 28314 disjun0 29408 ffsrn 29504 difioo 29544 eulerpartlemt 30433 subfacp1lem1 31161 cvmscld 31255 mthmpps 31479 refssfne 32353 topjoin 32360 poimirlem3 33412 poimirlem28 33437 rntrclfvOAI 37254 istopclsd 37263 nacsfix 37275 diophrw 37322 clcnvlem 37930 cnvrcl0 37932 dmtrcl 37934 rntrcl 37935 iunrelexp0 37994 dmtrclfvRP 38022 rntrclfv 38024 cotrclrcl 38034 clsk3nimkb 38338 limciccioolb 39853 limcicciooub 39869 ioccncflimc 40098 icocncflimc 40102 stoweidlem44 40261 dirkercncflem3 40322 fourierdlem62 40385 ismeannd 40684 |
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