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Related theorems Unicode version |
| 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 1700 |
. 2
|
| 4 | 1, 3 | ax-mp 6 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: zfausab 1704 snex 1859 moabex 1868 xpex 2488 funopabex 2742 fvclex 2908 abrexexlem1 2910 abrexex 2912 oprabex 3044 qsex 3231 pw2en 3348 sbthlem2 3350 phplem3 3405 phplem5 3407 php 3409 pssnn 3428 inf3lem3 3466 aceq3 3556 aceq5lem4 3561 aceq6b 3565 numthlem 3598 zornlem1 3603 hta 3619 niex 3803 enqex 3842 npex 3885 enrex 3972 nnssre 4425 nnex 4431 nn0ex 4540 zex 4571 reex 4640 qex 4641 revalt 4794 imvalt 4795 infxpidmlem9 4941 infmap2lem2 4952 gch-kn 4957 shex 5115 chex 5130 |
| This theorem was proved from axioms: ax-1 3 ax-2 4 ax-3 5 ax-mp 6 ax-4 673 ax-5 674 ax-6 675 ax-7 676 ax-gen 677 ax-8 798 ax-9 799 ax-10 800 ax-11 801 ax-12 802 ax-14 805 ax-16 922 ax-17 925 ax-ext 1074 ax-rep 1075 |
| This theorem depends on definitions: df-bi 128 df-an 198 df-ex 679 df-sb 853 df-clab 1093 df-cleq 1097 df-clel 1099 df-v 1349 df-in 1491 df-ss 1492 |