Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
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 4159 | . 2 ⊢ (𝐴 ⊆ 𝐵 ↔ (𝐴 ∪ 𝐵) = 𝐵) | |
2 | uncom 4132 | . . 3 ⊢ (𝐴 ∪ 𝐵) = (𝐵 ∪ 𝐴) | |
3 | 2 | eqeq1i 2829 | . 2 ⊢ ((𝐴 ∪ 𝐵) = 𝐵 ↔ (𝐵 ∪ 𝐴) = 𝐵) |
4 | 1, 3 | bitri 277 | 1 ⊢ (𝐴 ⊆ 𝐵 ↔ (𝐵 ∪ 𝐴) = 𝐵) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 208 = wceq 1536 ∪ cun 3937 ⊆ wss 3939 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1969 ax-7 2014 ax-8 2115 ax-9 2123 ax-10 2144 ax-11 2160 ax-12 2176 ax-ext 2796 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-tru 1539 df-ex 1780 df-nf 1784 df-sb 2069 df-clab 2803 df-cleq 2817 df-clel 2896 df-nfc 2966 df-v 3499 df-un 3944 df-in 3946 df-ss 3955 |
This theorem is referenced by: unabs 4234 tppreqb 4741 pwssun 5459 pwundifOLD 5460 relresfld 6130 ordssun 6293 ordequn 6294 oneluni 6306 fsnunf 6950 sorpssun 7459 ordunpr 7544 fodomr 8671 enp1ilem 8755 pwfilem 8821 brwdom2 9040 sucprcreg 9068 dfacfin7 9824 hashbclem 13813 incexclem 15194 ramub1lem1 16365 ramub1lem2 16366 mreexmrid 16917 lspun0 19786 lbsextlem4 19936 cldlp 21761 ordtuni 21801 lfinun 22136 cldsubg 22722 trust 22841 nulmbl2 24140 limcmpt2 24485 cnplimc 24488 dvreslem 24510 dvaddbr 24538 dvmulbr 24539 lhop 24616 plypf1 24805 coeeulem 24817 coeeu 24818 coef2 24824 rlimcnp 25546 ex-un 28206 shs0i 29229 chj0i 29235 disjun0 30348 ffsrn 30468 difioo 30508 symgcom2 30732 eulerpartlemt 31633 subfacp1lem1 32430 cvmscld 32524 mthmpps 32833 refssfne 33710 topjoin 33717 pibt2 34702 poimirlem3 34899 poimirlem28 34924 rntrclfvOAI 39294 istopclsd 39303 nacsfix 39315 diophrw 39362 clcnvlem 39989 cnvrcl0 39991 dmtrcl 39993 rntrcl 39994 iunrelexp0 40053 dmtrclfvRP 40081 rntrclfv 40083 cotrclrcl 40093 clsk3nimkb 40396 limciccioolb 41908 limcicciooub 41924 ioccncflimc 42174 icocncflimc 42178 stoweidlem44 42336 dirkercncflem3 42397 fourierdlem62 42460 ismeannd 42756 |
Copyright terms: Public domain | W3C validator |