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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 3961 | . . . . 5 ⊢ (𝑥 = 𝐴 → (𝑥 ⊆ 𝑦 ↔ 𝐴 ⊆ 𝑦)) | |
| 2 | 1 | anbi1d 642 | . . . 4 ⊢ (𝑥 = 𝐴 → ((𝑥 ⊆ 𝑦 ∧ Tr 𝑦) ↔ (𝐴 ⊆ 𝑦 ∧ Tr 𝑦))) |
| 3 | 2 | exbidv 1949 | . . 3 ⊢ (𝑥 = 𝐴 → (∃𝑦(𝑥 ⊆ 𝑦 ∧ Tr 𝑦) ↔ ∃𝑦(𝐴 ⊆ 𝑦 ∧ Tr 𝑦))) |
| 4 | vex 3457 | . . . . 5 ⊢ 𝑥 ∈ V | |
| 5 | 4 | tz9.1 9697 | . . . 4 ⊢ ∃𝑦(𝑥 ⊆ 𝑦 ∧ Tr 𝑦 ∧ ∀𝑧((𝑥 ⊆ 𝑧 ∧ Tr 𝑧) → 𝑦 ⊆ 𝑧)) |
| 6 | 3simpa 1164 | . . . 4 ⊢ ((𝑥 ⊆ 𝑦 ∧ Tr 𝑦 ∧ ∀𝑧((𝑥 ⊆ 𝑧 ∧ Tr 𝑧) → 𝑦 ⊆ 𝑧)) → (𝑥 ⊆ 𝑦 ∧ Tr 𝑦)) | |
| 7 | 5, 6 | eximii 1865 | . . 3 ⊢ ∃𝑦(𝑥 ⊆ 𝑦 ∧ Tr 𝑦) |
| 8 | 3, 7 | vtoclg 3521 | . 2 ⊢ (𝐴 ∈ 𝑉 → ∃𝑦(𝐴 ⊆ 𝑦 ∧ Tr 𝑦)) |
| 9 | ttcmin 36951 | . . . 4 ⊢ ((𝐴 ⊆ 𝑦 ∧ Tr 𝑦) → TC+ 𝐴 ⊆ 𝑦) | |
| 10 | vex 3457 | . . . 4 ⊢ 𝑦 ∈ V | |
| 11 | ssexg 5289 | . . . 4 ⊢ ((TC+ 𝐴 ⊆ 𝑦 ∧ 𝑦 ∈ V) → TC+ 𝐴 ∈ V) | |
| 12 | 9, 10, 11 | sylancl 597 | . . 3 ⊢ ((𝐴 ⊆ 𝑦 ∧ Tr 𝑦) → TC+ 𝐴 ∈ V) |
| 13 | 12 | exlimiv 1958 | . 2 ⊢ (∃𝑦(𝐴 ⊆ 𝑦 ∧ Tr 𝑦) → TC+ 𝐴 ∈ V) |
| 14 | 8, 13 | syl 18 | 1 ⊢ (𝐴 ∈ 𝑉 → TC+ 𝐴 ∈ V) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 400 ∧ w3a 1101 ∀wal 1566 = wceq 1568 ∃wex 1807 ∈ wcel 2141 Vcvv 3453 ⊆ wss 3904 Tr wtr 5217 TC+ cttc 36941 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1823 ax-4 1837 ax-5 1938 ax-6 1995 ax-7 2036 ax-8 2143 ax-9 2151 ax-10 2174 ax-11 2190 ax-12 2211 ax-ext 2733 ax-rep 5237 ax-sep 5256 ax-nul 5268 ax-pr 5404 ax-un 7732 ax-inf2 9609 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1102 df-3an 1103 df-tru 1571 df-fal 1581 df-ex 1808 df-nf 1812 df-sb 2095 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-ral 3078 df-rex 3088 df-reu 3368 df-rab 3415 df-v 3455 df-sbc 3744 df-csb 3853 df-dif 3907 df-un 3909 df-in 3911 df-ss 3921 df-pss 3924 df-nul 4286 df-if 4487 df-pw 4563 df-sn 4589 df-pr 4591 df-op 4595 df-uni 4872 df-iun 4957 df-br 5109 df-opab 5173 df-mpt 5192 df-tr 5218 df-id 5556 df-eprel 5561 df-po 5569 df-so 5570 df-fr 5614 df-we 5616 df-xp 5667 df-rel 5668 df-cnv 5669 df-co 5670 df-dm 5671 df-rn 5672 df-res 5673 df-ima 5674 df-pred 6302 df-ord 6363 df-on 6364 df-lim 6365 df-suc 6366 df-iota 6492 df-fun 6538 df-fn 6539 df-f 6540 df-f1 6541 df-fo 6542 df-f1o 6543 df-fv 6544 df-ov 7413 df-om 7862 df-2nd 7986 df-frecs 8277 df-wrecs 8308 df-recs 8357 df-rdg 8396 df-ttc 36942 |
| This theorem is referenced by: ttcexbi 36988 dfttc3g 36989 |
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