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| Description: The subset of a set is also a set. |
| Ref | Expression |
|---|---|
| ssexi.1 |
|
| ssexi.2 |
|
| Ref | Expression |
|---|---|
| ssexi |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ssexi.2 |
. 2
| |
| 2 | ssexi.1 |
. . 3
| |
| 3 | 2 | ssex 3455 |
. 2
|
| 4 | 1, 3 | ax-mp 7 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: zfausab 3459 snexOLD 3493 ord3ex 3497 moabex 3513 opabex 4538 fvclex 4832 abrexexlem1 4834 abrexex 4836 oprabex 4948 pw2en 5505 sbthlem2 5511 phplem2 5603 phplem4 5605 php 5607 pssnn 5628 abfii2 5652 abfii4 5654 ordtypelem1 5684 ordtypelem7 5690 hartog 5693 inf3lem3 5721 hta 5858 aceq3 5895 aceq5lem4 5900 aceq6b 5904 numthlem 5945 zorn2lem1 5950 brdom7disj 5966 brdom6disj 5967 niex 6161 enqex 6200 npex 6243 enrex 6330 reex 6465 nnex 7116 nn0ex 7314 zex 7353 qex 7448 sumex 8241 infxpidmlem9 8829 infmap2lem2 8849 gch-kn 8856 subbas 8914 bcthlem15 9291 issubg 9425 issubgi 9431 sspval 9721 ajfval 9809 stoiglem 10250 shex 10710 chex 10728 hmopex 11439 bnj20 12386 bnj53 13193 isprm2lem 13774 dfon2lem7 13855 prodex 14656 issubcat 15193 ordtypelem1OLD 15375 ordtypelem7OLD 15381 hartogOLD 15384 cptclsscpt 15432 2ndcctbss 15478 neibastop2lem1 15519 neibastop2lem4 15522 filssufil 15571 heiborlem23 15977 heiborlem25 15979 heiborlem26 15980 heiborlem29 15983 heiborlem40 15994 phtpcval 16058 pcofval 16072 pi1bval 16088 rnghomval 16118 cmtfval 16937 cvrfval 16987 csubspset 17208 lineset 17219 psubspset 17225 psubclset 17346 pautset 17395 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 1304 ax-gen 1305 ax-8 1306 ax-9 1307 ax-10 1308 ax-11 1309 ax-12 1310 ax-17 1317 ax-4 1319 ax-5o 1321 ax-6o 1324 ax-9o 1481 ax-10o 1500 ax-16 1580 ax-11o 1588 ax-ext 1865 ax-sep 3438 |
| This theorem depends on definitions: df-bi 164 df-or 241 df-an 242 df-ex 1327 df-sb 1536 df-clab 1872 df-cleq 1877 df-clel 1880 df-v 2294 df-in 2603 df-ss 2605 |