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| Mirrors > Home > ILE Home > Th. List > ssel2 | GIF version | ||
| Description: Membership relationships follow from a subclass relationship. (Contributed by NM, 7-Jun-2004.) |
| Ref | Expression |
|---|---|
| ssel2 | ⊢ ((𝐴 ⊆ 𝐵 ∧ 𝐶 ∈ 𝐴) → 𝐶 ∈ 𝐵) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ssel 3242 | . 2 ⊢ (𝐴 ⊆ 𝐵 → (𝐶 ∈ 𝐴 → 𝐶 ∈ 𝐵)) | |
| 2 | 1 | imp 124 | 1 ⊢ ((𝐴 ⊆ 𝐵 ∧ 𝐶 ∈ 𝐴) → 𝐶 ∈ 𝐵) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 104 ∈ wcel 2209 ⊆ wss 3220 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-11 1559 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-ext 2220 |
| This proof depends on definitions: df-bi 117 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-in 3226 df-ss 3233 |
| This theorem is used by: elnn 4753 funimass4 5753 fvelimab 5759 ssimaex 5764 funconstss 5827 rexima 5960 ralima 5961 1st2nd 6415 f1o2ndf1 6464 tfri1dALT 6622 eldju1st 7412 axsuploc 8399 lbinf 9281 dfinfre 9289 lbzbi 10026 elfzom1elp1fzo 10631 ssfzo12 10653 seq3split 10940 seqsplitg 10941 shftlem 11597 uzwodc 12833 subgintm 14054 cntzsubg 14165 subrngintm 14604 subrgintm 14635 tgcl 15256 neipsm 15346 txbasval 15459 elmopn2 15641 metrest 15698 cncfmet 15784 negcncf 15797 ply1term 15935 plyconst 15937 reeff1olem 15963 usgruspgrben 16593 |
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