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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 2211 | . 2 ⊢ 𝐵 = 𝐶 |
| 4 | 1, 3 | sseqtri 3235 | 1 ⊢ 𝐴 ⊆ 𝐶 |
| Colors of variables: wff set class |
| Syntax hints: = wceq 1373 ⊆ wss 3174 |
| 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 1471 ax-7 1472 ax-gen 1473 ax-ie1 1517 ax-ie2 1518 ax-8 1528 ax-11 1530 ax-4 1534 ax-17 1550 ax-i9 1554 ax-ial 1558 ax-i5r 1559 ax-ext 2189 |
| This theorem depends on definitions: df-bi 117 df-nf 1485 df-sb 1787 df-clab 2194 df-cleq 2200 df-clel 2203 df-in 3180 df-ss 3187 |
| This theorem is referenced by: eqimss2i 3258 difdif2ss 3438 snsspr1 3792 snsspr2 3793 snsstp1 3794 snsstp2 3795 snsstp3 3796 prsstp12 3797 prsstp13 3798 prsstp23 3799 iunxdif2 3990 pwpwssunieq 4030 sssucid 4480 opabssxp 4767 dmresi 5033 cnvimass 5064 ssrnres 5144 cnvcnv 5154 cnvssrndm 5223 dmmpossx 6308 tfrcllemssrecs 6461 sucinc 6554 mapex 6764 exmidpw 7031 exmidpweq 7032 casefun 7213 djufun 7232 pw1ne1 7375 ressxr 8151 ltrelxr 8168 nnssnn0 9333 un0addcl 9363 un0mulcl 9364 nn0ssxnn0 9396 fzssnn 10225 fzossnn0 10334 isumclim3 11849 isprm3 12555 phimullem 12662 tgvalex 13210 eqgfval 13673 cnfldbas 14437 mpocnfldadd 14438 mpocnfldmul 14440 cnfldcj 14442 cnfldtset 14443 cnfldle 14444 cnfldds 14445 cnrest2 14823 qtopbasss 15108 tgqioo 15142 |
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