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| Mirrors > Home > ILE Home > Th. List > sseqtrri | GIF version | ||
| Description: Substitution of equality into a subclass relationship. (Contributed by NM, 4-Apr-1995.) |
| Ref | Expression |
|---|---|
| sseqtrri.1 | ⊢ 𝐴 ⊆ 𝐵 |
| sseqtrri.2 | ⊢ 𝐶 = 𝐵 |
| Ref | Expression |
|---|---|
| sseqtrri | ⊢ 𝐴 ⊆ 𝐶 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | sseqtrri.1 | . 2 ⊢ 𝐴 ⊆ 𝐵 | |
| 2 | sseqtrri.2 | . . 3 ⊢ 𝐶 = 𝐵 | |
| 3 | 2 | eqcomi 2238 | . 2 ⊢ 𝐵 = 𝐶 |
| 4 | 1, 3 | sseqtri 3276 | 1 ⊢ 𝐴 ⊆ 𝐶 |
| Colors of variables: wff set class |
| Syntax hints: = wceq 1398 ⊆ wss 3214 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-11 1555 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-ext 2216 |
| This theorem depends on definitions: df-bi 117 df-nf 1510 df-sb 1812 df-clab 2221 df-cleq 2227 df-clel 2230 df-in 3220 df-ss 3227 |
| This theorem is referenced by: eqimss2i 3299 difdif2ss 3482 snsspr1 3847 snsspr2 3848 snsstp1 3849 snsstp2 3850 snsstp3 3851 prsstp12 3852 prsstp13 3853 prsstp23 3854 iunxdif2 4045 pwpwssunieq 4085 sssucid 4541 opabssxp 4829 dmresi 5098 cnvimass 5130 ssrnres 5210 cnvcnv 5220 cnvssrndm 5289 dmmpossx 6408 tfrcllemssrecs 6596 sucinc 6691 mapex 6901 exmidpw 7181 exmidpweq 7182 casefun 7389 djufun 7408 pw1ne1 7552 ressxr 8333 ltrelxr 8350 nnssnn0 9519 un0addcl 9549 un0mulcl 9550 nn0ssxnn0 9586 fzssnn 10426 fzossnn0 10536 isumclim3 12137 isprm3 12843 phimullem 12950 ballotfilem7 13226 tgvalex 13563 eqgfval 13978 cnfldbas 14837 mpocnfldadd 14838 mpocnfldmul 14840 cnfldcj 14842 cnfldtset 14843 cnfldle 14844 cnfldds 14845 cnrest2 15230 qtopbasss 15515 tgqioo 15549 |
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