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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 2181 | . 2 ⊢ 𝐵 = 𝐶 |
4 | 1, 3 | sseqtri 3189 | 1 ⊢ 𝐴 ⊆ 𝐶 |
Colors of variables: wff set class |
Syntax hints: = wceq 1353 ⊆ wss 3129 |
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 1447 ax-7 1448 ax-gen 1449 ax-ie1 1493 ax-ie2 1494 ax-8 1504 ax-11 1506 ax-4 1510 ax-17 1526 ax-i9 1530 ax-ial 1534 ax-i5r 1535 ax-ext 2159 |
This theorem depends on definitions: df-bi 117 df-nf 1461 df-sb 1763 df-clab 2164 df-cleq 2170 df-clel 2173 df-in 3135 df-ss 3142 |
This theorem is referenced by: eqimss2i 3212 difdif2ss 3392 snsspr1 3740 snsspr2 3741 snsstp1 3742 snsstp2 3743 snsstp3 3744 prsstp12 3745 prsstp13 3746 prsstp23 3747 iunxdif2 3933 pwpwssunieq 3973 sssucid 4413 opabssxp 4698 dmresi 4959 cnvimass 4988 ssrnres 5068 cnvcnv 5078 cnvssrndm 5147 dmmpossx 6195 tfrcllemssrecs 6348 sucinc 6441 mapex 6649 exmidpw 6903 exmidpweq 6904 casefun 7079 djufun 7098 pw1ne1 7223 ressxr 7995 ltrelxr 8012 nnssnn0 9173 un0addcl 9203 un0mulcl 9204 nn0ssxnn0 9236 fzssnn 10061 fzossnn0 10168 isumclim3 11422 isprm3 12108 phimullem 12215 cnfldbas 13264 cnfldadd 13265 cnfldmul 13266 cnfldcj 13267 tgvalex 13332 cnrest2 13518 qtopbasss 13803 tgqioo 13829 |
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