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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 2719 |
. 2
|
| 4 | 1, 3 | ax-mp 7 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: zfausab 2723 snex 2750 moabex 2766 opabex 3609 fvclex 3856 abrexexlem1 3858 abrexex 3860 oprabex 4019 pw2en 4446 sbthlem2 4448 phplem2 4509 phplem4 4511 php 4513 pssnn 4534 abfii2OLD 4562 abfii4OLD 4564 inf3lem3 4615 hta 4728 aceq3 4733 aceq5lem4 4738 aceq6b 4742 numthlem 4783 zorn2lem1 4788 brdom7disj 4804 brdom6disj 4805 niex 5009 enqex 5048 npex 5091 enrex 5178 reex 5312 nnex 5933 nn0ex 6105 zex 6144 qex 6268 sumex 6981 infxpidmlem9 7560 infmap2lem2 7580 gch-kn 7587 subbasOLD 7644 bcthlem15 8013 issubg 8116 issubgi 8122 sspval 8382 ajfval 8469 shex 9077 chex 9095 hmopex 9802 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 962 ax-gen 963 ax-8 964 ax-10 966 ax-12 968 ax-17 971 ax-4 973 ax-5o 975 ax-6o 978 ax-9o 1123 ax-10o 1140 ax-16 1210 ax-11o 1218 ax-ext 1459 ax-sep 2703 |
| This theorem depends on definitions: df-bi 147 df-an 225 df-ex 981 df-sb 1172 df-clab 1464 df-cleq 1469 df-clel 1472 df-v 1812 df-in 2051 df-ss 2053 |