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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 3943 | . . . . 5 ⊢ (𝑥 = 𝐴 → (𝑥 ⊆ 𝑦 ↔ 𝐴 ⊆ 𝑦)) | |
| 2 | 1 | anbi1d 633 | . . . 4 ⊢ (𝑥 = 𝐴 → ((𝑥 ⊆ 𝑦 ∧ Tr 𝑦) ↔ (𝐴 ⊆ 𝑦 ∧ Tr 𝑦))) |
| 3 | 2 | exbidv 1924 | . . 3 ⊢ (𝑥 = 𝐴 → (∃𝑦(𝑥 ⊆ 𝑦 ∧ Tr 𝑦) ↔ ∃𝑦(𝐴 ⊆ 𝑦 ∧ Tr 𝑦))) |
| 4 | vex 3432 | . . . . 5 ⊢ 𝑥 ∈ V | |
| 5 | 4 | tz9.1 9644 | . . . 4 ⊢ ∃𝑦(𝑥 ⊆ 𝑦 ∧ Tr 𝑦 ∧ ∀𝑧((𝑥 ⊆ 𝑧 ∧ Tr 𝑧) → 𝑦 ⊆ 𝑧)) |
| 6 | 3simpa 1150 | . . . 4 ⊢ ((𝑥 ⊆ 𝑦 ∧ Tr 𝑦 ∧ ∀𝑧((𝑥 ⊆ 𝑧 ∧ Tr 𝑧) → 𝑦 ⊆ 𝑧)) → (𝑥 ⊆ 𝑦 ∧ Tr 𝑦)) | |
| 7 | 5, 6 | eximii 1840 | . . 3 ⊢ ∃𝑦(𝑥 ⊆ 𝑦 ∧ Tr 𝑦) |
| 8 | 3, 7 | vtoclg 3498 | . 2 ⊢ (𝐴 ∈ 𝑉 → ∃𝑦(𝐴 ⊆ 𝑦 ∧ Tr 𝑦)) |
| 9 | ttcmin 36721 | . . . 4 ⊢ ((𝐴 ⊆ 𝑦 ∧ Tr 𝑦) → TC+ 𝐴 ⊆ 𝑦) | |
| 10 | vex 3432 | . . . 4 ⊢ 𝑦 ∈ V | |
| 11 | ssexg 5254 | . . . 4 ⊢ ((TC+ 𝐴 ⊆ 𝑦 ∧ 𝑦 ∈ V) → TC+ 𝐴 ∈ V) | |
| 12 | 9, 10, 11 | sylancl 588 | . . 3 ⊢ ((𝐴 ⊆ 𝑦 ∧ Tr 𝑦) → TC+ 𝐴 ∈ V) |
| 13 | 12 | exlimiv 1933 | . 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 396 ∧ w3a 1088 ∀wal 1541 = wceq 1543 ∃wex 1782 ∈ wcel 2115 Vcvv 3428 ⊆ wss 3886 Tr wtr 5182 TC+ cttc 36711 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1913 ax-6 1970 ax-7 2011 ax-8 2117 ax-9 2125 ax-10 2148 ax-11 2164 ax-12 2185 ax-ext 2708 ax-rep 5202 ax-sep 5221 ax-nul 5231 ax-pr 5365 ax-un 7681 ax-inf2 9556 |
| This theorem depends on definitions: df-bi 208 df-an 397 df-or 850 df-3or 1089 df-3an 1090 df-tru 1546 df-fal 1556 df-ex 1783 df-nf 1787 df-sb 2070 df-mo 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2932 df-ral 3051 df-rex 3061 df-reu 3342 df-rab 3389 df-v 3430 df-sbc 3727 df-csb 3835 df-dif 3889 df-un 3891 df-in 3893 df-ss 3903 df-pss 3906 df-nul 4265 df-if 4458 df-pw 4534 df-sn 4559 df-pr 4561 df-op 4565 df-uni 4842 df-iun 4926 df-br 5076 df-opab 5138 df-mpt 5157 df-tr 5183 df-id 5516 df-eprel 5521 df-po 5529 df-so 5530 df-fr 5574 df-we 5576 df-xp 5627 df-rel 5628 df-cnv 5629 df-co 5630 df-dm 5631 df-rn 5632 df-res 5633 df-ima 5634 df-pred 6255 df-ord 6316 df-on 6317 df-lim 6318 df-suc 6319 df-iota 6444 df-fun 6490 df-fn 6491 df-f 6492 df-f1 6493 df-fo 6494 df-f1o 6495 df-fv 6496 df-ov 7362 df-om 7810 df-2nd 7935 df-frecs 8224 df-wrecs 8255 df-recs 8304 df-rdg 8342 df-ttc 36712 |
| This theorem is referenced by: ttcexbi 36758 dfttc3g 36759 |
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