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| Description: Substitution of equality into a subclass relationship. |
| Ref | Expression |
|---|---|
| sseqtr.1 |
|
| sseqtr.2 |
|
| Ref | Expression |
|---|---|
| sseqtri |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | sseqtr.1 |
. 2
| |
| 2 | sseqtr.2 |
. . 3
| |
| 3 | 2 | sseq2i 2642 |
. 2
|
| 4 | 1, 3 | mpbi 206 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: sseqtr4i 2650 eqimssi 2668 abssi 2682 ssun2 2768 snsspr2 3137 opabssOLD 3398 difex2 3802 unixpss 4094 0ima 4284 oelim2 5270 ecopoprdm 5368 sbthlem7 5516 abfii3 5653 abfii4 5654 rankuni 5809 rankc2 5817 rankxpu 5822 rankxplim 5823 cf0 6058 unirnioo 7571 unbenlem 8773 cncnplem1 9051 nmcn3 9680 abscncfALT 9683 choc1 10924 shlej1i 10981 chub2i 11026 span0 11098 spanuni 11100 sshhococi 11102 chsup0 11104 spansnpji 11134 mayetes3i 11310 nmcopexlem4 11591 nmcfnexlem4 11620 pjimai 11748 pj3i 11781 shatomistici 11933 hatomistici 11934 atcvat4i 11969 divalglem2 13698 divalglem5 13700 nocvxminlem 14028 nocvxmin 14029 axfelem0 14030 axfelem1 14031 dmhmph 14886 dtopcl 14948 ranleqt 15021 reldded 15088 relrded 15089 reldcat 15109 relrcat 15110 hscptsscld 15434 ist1-2 15542 filnet 15645 heiborlem6 15960 heiborlem11 15965 heiborlem12 15966 heiborlem14 15968 heiborlem16 15970 pcocn 16076 pcohtpylem3 16082 isdivrng2 16111 |
| 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-10 1308 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 |
| This theorem depends on definitions: df-bi 164 df-an 242 df-ex 1327 df-sb 1536 df-clab 1872 df-cleq 1877 df-clel 1880 df-in 2603 df-ss 2605 |