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Mirrors > Home > ILE Home > Th. List > ssriv | GIF version |
Description: Inference based on subclass definition. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
ssriv.1 | ⊢ (𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐵) |
Ref | Expression |
---|---|
ssriv | ⊢ 𝐴 ⊆ 𝐵 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dfss2 3131 | . 2 ⊢ (𝐴 ⊆ 𝐵 ↔ ∀𝑥(𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐵)) | |
2 | ssriv.1 | . 2 ⊢ (𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐵) | |
3 | 1, 2 | mpgbir 1441 | 1 ⊢ 𝐴 ⊆ 𝐵 |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∈ wcel 2136 ⊆ wss 3116 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-5 1435 ax-7 1436 ax-gen 1437 ax-ie1 1481 ax-ie2 1482 ax-8 1492 ax-11 1494 ax-4 1498 ax-17 1514 ax-i9 1518 ax-ial 1522 ax-i5r 1523 ax-ext 2147 |
This theorem depends on definitions: df-bi 116 df-nf 1449 df-sb 1751 df-clab 2152 df-cleq 2158 df-clel 2161 df-in 3122 df-ss 3129 |
This theorem is referenced by: ssid 3162 ssv 3164 difss 3248 ssun1 3285 inss1 3342 unssdif 3357 inssdif 3358 unssin 3361 inssun 3362 difindiss 3376 undif3ss 3383 0ss 3447 difprsnss 3711 snsspw 3744 pwprss 3785 pwtpss 3786 uniin 3809 iuniin 3876 iundif2ss 3931 iunpwss 3957 pwuni 4171 pwunss 4261 omsson 4590 limom 4591 xpsspw 4716 dmin 4812 dmrnssfld 4867 dmcoss 4873 dminss 5018 imainss 5019 dmxpss 5034 rnxpid 5038 mapsspm 6648 pmsspw 6649 uniixp 6687 snexxph 6915 djuss 7035 pw1on 7182 enq0enq 7372 nqnq0pi 7379 nqnq0 7382 apsscn 8545 sup3exmid 8852 zssre 9198 zsscn 9199 nnssz 9208 uzssz 9485 divfnzn 9559 zssq 9565 qssre 9568 rpssre 9600 ixxssxr 9836 ixxssixx 9838 iooval2 9851 ioossre 9871 rge0ssre 9913 fz1ssnn 9991 fzssuz 10000 fzssp1 10002 uzdisj 10028 fz0ssnn0 10051 nn0disj 10073 fzossfz 10100 fzouzsplit 10114 fzossnn 10124 fzo0ssnn0 10150 seq3coll 10755 fclim 11235 infssuzcldc 11884 prmssnn 12044 restsspw 12566 unitg 12702 cldss2 12746 blssioo 13185 tgioo 13186 limccl 13268 limcresi 13275 dvef 13328 reeff1o 13334 bj-omsson 13844 |
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