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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 2714 |
. 2
|
| 4 | 1, 3 | ax-mp 7 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: zfausab 2718 snex 2745 moabex 2761 opabex 3601 fvclex 3847 abrexexlem1 3849 abrexex 3851 oprabex 4010 pw2en 4432 sbthlem2 4434 phplem2 4495 phplem4 4497 php 4499 pssnn 4519 abfii2 4542 abfii4 4544 inf3lem3 4595 hta 4708 aceq3 4713 aceq5lem4 4718 aceq6b 4722 numthlem 4763 zorn2lem1 4768 brdom7disj 4784 brdom6disj 4785 niex 4989 enqex 5028 npex 5071 enrex 5158 reex 5292 nnex 5889 nn0ex 6060 zex 6099 qex 6214 sumex 6927 infxpidmlem9 7511 infmap2lem2 7530 gch-kn 7537 subbas 7594 bcthlem15 7963 issubg 8068 issubgi 8074 sspval 8329 ajfval 8413 shex 9016 chex 9034 hmopex 9742 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 960 ax-gen 961 ax-8 962 ax-10 964 ax-12 966 ax-17 969 ax-4 971 ax-5o 973 ax-6o 976 ax-9o 1121 ax-10o 1138 ax-16 1208 ax-11o 1216 ax-ext 1457 ax-sep 2698 |
| This theorem depends on definitions: df-bi 147 df-an 225 df-ex 979 df-sb 1170 df-clab 1462 df-cleq 1467 df-clel 1470 df-v 1808 df-in 2047 df-ss 2049 |