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| Mirrors > Home > MPE Home > Th. List > Mathboxes > ttcexg | Structured version Visualization version GIF version | ||
| Description: The transitive closure of a set is a set, assuming Transitive Containment. (Contributed by Matthew House, 6-Apr-2026.) |
| Ref | Expression |
|---|---|
| ttcexg | ⊢ (𝐴 ∈ 𝑉 → TC+ 𝐴 ∈ V) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | sseq1 3952 | . . . . 5 ⊢ (𝑥 = 𝐴 → (𝑥 ⊆ 𝑦 ↔ 𝐴 ⊆ 𝑦)) | |
| 2 | 1 | anbi1d 639 | . . . 4 ⊢ (𝑥 = 𝐴 → ((𝑥 ⊆ 𝑦 ∧ Tr 𝑦) ↔ (𝐴 ⊆ 𝑦 ∧ Tr 𝑦))) |
| 3 | 2 | exbidv 1931 | . . 3 ⊢ (𝑥 = 𝐴 → (∃𝑦(𝑥 ⊆ 𝑦 ∧ Tr 𝑦) ↔ ∃𝑦(𝐴 ⊆ 𝑦 ∧ Tr 𝑦))) |
| 4 | vex 3448 | . . . . 5 ⊢ 𝑥 ∈ V | |
| 5 | 4 | tz9.1 9670 | . . . 4 ⊢ ∃𝑦(𝑥 ⊆ 𝑦 ∧ Tr 𝑦 ∧ ∀𝑧((𝑥 ⊆ 𝑧 ∧ Tr 𝑧) → 𝑦 ⊆ 𝑧)) |
| 6 | 3simpa 1157 | . . . 4 ⊢ ((𝑥 ⊆ 𝑦 ∧ Tr 𝑦 ∧ ∀𝑧((𝑥 ⊆ 𝑧 ∧ Tr 𝑧) → 𝑦 ⊆ 𝑧)) → (𝑥 ⊆ 𝑦 ∧ Tr 𝑦)) | |
| 7 | 5, 6 | eximii 1847 | . . 3 ⊢ ∃𝑦(𝑥 ⊆ 𝑦 ∧ Tr 𝑦) |
| 8 | 3, 7 | vtoclg 3512 | . 2 ⊢ (𝐴 ∈ 𝑉 → ∃𝑦(𝐴 ⊆ 𝑦 ∧ Tr 𝑦)) |
| 9 | ttcmin 36794 | . . . 4 ⊢ ((𝐴 ⊆ 𝑦 ∧ Tr 𝑦) → TC+ 𝐴 ⊆ 𝑦) | |
| 10 | vex 3448 | . . . 4 ⊢ 𝑦 ∈ V | |
| 11 | ssexg 5269 | . . . 4 ⊢ ((TC+ 𝐴 ⊆ 𝑦 ∧ 𝑦 ∈ V) → TC+ 𝐴 ∈ V) | |
| 12 | 9, 10, 11 | sylancl 594 | . . 3 ⊢ ((𝐴 ⊆ 𝑦 ∧ Tr 𝑦) → TC+ 𝐴 ∈ V) |
| 13 | 12 | exlimiv 1940 | . 2 ⊢ (∃𝑦(𝐴 ⊆ 𝑦 ∧ Tr 𝑦) → TC+ 𝐴 ∈ V) |
| 14 | 8, 13 | syl 17 | 1 ⊢ (𝐴 ∈ 𝑉 → TC+ 𝐴 ∈ V) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 398 ∧ w3a 1095 ∀wal 1548 = wceq 1550 ∃wex 1789 ∈ wcel 2132 Vcvv 3444 ⊆ wss 3895 Tr wtr 5197 TC+ cttc 36784 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1805 ax-4 1819 ax-5 1920 ax-6 1977 ax-7 2018 ax-8 2134 ax-9 2142 ax-10 2165 ax-11 2181 ax-12 2202 ax-ext 2724 ax-rep 5217 ax-sep 5236 ax-nul 5246 ax-pr 5380 ax-un 7703 ax-inf2 9582 |
| This theorem depends on definitions: df-bi 209 df-an 399 df-or 857 df-3or 1096 df-3an 1097 df-tru 1553 df-fal 1563 df-ex 1790 df-nf 1794 df-sb 2081 df-mo 2556 df-eu 2586 df-clab 2731 df-cleq 2744 df-clel 2827 df-nfc 2901 df-ne 2948 df-ral 3067 df-rex 3077 df-reu 3358 df-rab 3405 df-v 3446 df-sbc 3736 df-csb 3844 df-dif 3898 df-un 3900 df-in 3902 df-ss 3912 df-pss 3915 df-nul 4277 df-if 4471 df-pw 4547 df-sn 4573 df-pr 4575 df-op 4579 df-uni 4856 df-iun 4941 df-br 5091 df-opab 5153 df-mpt 5172 df-tr 5198 df-id 5531 df-eprel 5536 df-po 5544 df-so 5545 df-fr 5589 df-we 5591 df-xp 5642 df-rel 5643 df-cnv 5644 df-co 5645 df-dm 5646 df-rn 5647 df-res 5648 df-ima 5649 df-pred 6273 df-ord 6334 df-on 6335 df-lim 6336 df-suc 6337 df-iota 6462 df-fun 6508 df-fn 6509 df-f 6510 df-f1 6511 df-fo 6512 df-f1o 6513 df-fv 6514 df-ov 7384 df-om 7832 df-2nd 7956 df-frecs 8246 df-wrecs 8277 df-recs 8326 df-rdg 8365 df-ttc 36785 |
| This theorem is referenced by: ttcexbi 36831 dfttc3g 36832 |
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