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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 3955 | . . . . 5 ⊢ (𝑥 = 𝐴 → (𝑥 ⊆ 𝑦 ↔ 𝐴 ⊆ 𝑦)) | |
| 2 | 1 | anbi1d 643 | . . . 4 ⊢ (𝑥 = 𝐴 → ((𝑥 ⊆ 𝑦 ∧ Tr 𝑦) ↔ (𝐴 ⊆ 𝑦 ∧ Tr 𝑦))) |
| 3 | 2 | exbidv 1954 | . . 3 ⊢ (𝑥 = 𝐴 → (∃𝑦(𝑥 ⊆ 𝑦 ∧ Tr 𝑦) ↔ ∃𝑦(𝐴 ⊆ 𝑦 ∧ Tr 𝑦))) |
| 4 | vex 3454 | . . . . 5 ⊢ 𝑥 ∈ V | |
| 5 | 4 | tz9.1 9708 | . . . 4 ⊢ ∃𝑦(𝑥 ⊆ 𝑦 ∧ Tr 𝑦 ∧ ∀𝑧((𝑥 ⊆ 𝑧 ∧ Tr 𝑧) → 𝑦 ⊆ 𝑧)) |
| 6 | 3simpa 1166 | . . . 4 ⊢ ((𝑥 ⊆ 𝑦 ∧ Tr 𝑦 ∧ ∀𝑧((𝑥 ⊆ 𝑧 ∧ Tr 𝑧) → 𝑦 ⊆ 𝑧)) → (𝑥 ⊆ 𝑦 ∧ Tr 𝑦)) | |
| 7 | 5, 6 | eximii 1870 | . . 3 ⊢ ∃𝑦(𝑥 ⊆ 𝑦 ∧ Tr 𝑦) |
| 8 | 3, 7 | vtoclg 3517 | . 2 ⊢ (𝐴 ∈ 𝑉 → ∃𝑦(𝐴 ⊆ 𝑦 ∧ Tr 𝑦)) |
| 9 | ttcmin 37206 | . . . 4 ⊢ ((𝐴 ⊆ 𝑦 ∧ Tr 𝑦) → TC+ 𝐴 ⊆ 𝑦) | |
| 10 | vex 3454 | . . . 4 ⊢ 𝑦 ∈ V | |
| 11 | ssexg 5280 | . . . 4 ⊢ ((TC+ 𝐴 ⊆ 𝑦 ∧ 𝑦 ∈ V) → TC+ 𝐴 ∈ V) | |
| 12 | 9, 10, 11 | sylancl 598 | . . 3 ⊢ ((𝐴 ⊆ 𝑦 ∧ Tr 𝑦) → TC+ 𝐴 ∈ V) |
| 13 | 12 | exlimiv 1963 | . 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 |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 ∧ w3a 1103 ∀wal 1568 = wceq 1570 ∃wex 1812 ∈ wcel 2145 Vcvv 3450 ⊆ wss 3898 Tr wtr 5211 TC+ cttc 37196 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2732 ax-rep 5231 ax-sep 5248 ax-nul 5259 ax-pr 5390 ax-un 7734 ax-inf2 9620 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-ral 3077 df-rex 3087 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3847 df-dif 3901 df-un 3903 df-in 3905 df-ss 3915 df-pss 3918 df-nul 4279 df-if 4482 df-pw 4558 df-sn 4584 df-pr 4586 df-op 4590 df-uni 4867 df-iun 4952 df-br 5103 df-opab 5167 df-mpt 5186 df-tr 5212 df-id 5542 df-eprel 5547 df-po 5555 df-so 5556 df-fr 5600 df-we 5602 df-xp 5653 df-rel 5654 df-cnv 5655 df-co 5656 df-dm 5657 df-rn 5658 df-res 5659 df-ima 5660 df-pred 6293 df-ord 6354 df-on 6355 df-lim 6356 df-suc 6357 df-iota 6483 df-fun 6529 df-fn 6530 df-f 6531 df-f1 6532 df-fo 6533 df-f1o 6534 df-fv 6535 df-ov 7411 df-om 7861 df-2nd 7985 df-frecs 8277 df-wrecs 8308 df-recs 8357 df-rdg 8396 df-ttc 37197 |
| This theorem is used by: ttcexbi 37243 dfttc3g 37244 |
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