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Mirrors > Home > ILE Home > Th. List > ssun1 | Unicode version |
Description: Subclass relationship for union of classes. Theorem 25 of [Suppes] p. 27. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
ssun1 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | orc 701 | . . 3 | |
2 | elun 3217 | . . 3 | |
3 | 1, 2 | sylibr 133 | . 2 |
4 | 3 | ssriv 3101 | 1 |
Colors of variables: wff set class |
Syntax hints: wo 697 wcel 1480 cun 3069 wss 3071 |
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 2121 |
This theorem depends on definitions: df-bi 116 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2126 df-cleq 2132 df-clel 2135 df-nfc 2270 df-v 2688 df-un 3075 df-in 3077 df-ss 3084 |
This theorem is referenced by: ssun2 3240 ssun3 3241 elun1 3243 inabs 3308 reuun1 3358 un00 3409 undifabs 3439 undifss 3443 snsspr1 3668 snsstp1 3670 snsstp2 3671 prsstp12 3673 exmidundif 4129 sssucid 4337 unexb 4363 dmexg 4803 fvun1 5487 dftpos2 6158 tpostpos2 6162 ac6sfi 6792 caserel 6972 finomni 7012 ressxr 7809 nnssnn0 8980 un0addcl 9010 un0mulcl 9011 nn0ssxnn0 9043 fsumsplit 11176 fsum2d 11204 fsumabs 11234 ennnfonelemss 11923 bdunexb 13118 |
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