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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 3938 | . . . . 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 1956 | . . 3 ⊢ (𝑥 = 𝐴 → (∃𝑦(𝑥 ⊆ 𝑦 ∧ Tr 𝑦) ↔ ∃𝑦(𝐴 ⊆ 𝑦 ∧ Tr 𝑦))) |
| 4 | vex 3458 | . . . . 5 ⊢ 𝑥 ∈ V | |
| 5 | 4 | tz9.1 9757 | . . . 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 3521 | . 2 ⊢ (𝐴 ∈ 𝑉 → ∃𝑦(𝐴 ⊆ 𝑦 ∧ Tr 𝑦)) |
| 9 | ttcmin 37462 | . . . 4 ⊢ ((𝐴 ⊆ 𝑦 ∧ Tr 𝑦) → TC+ 𝐴 ⊆ 𝑦) | |
| 10 | vex 3458 | . . . 4 ⊢ 𝑦 ∈ V | |
| 11 | ssexg 5285 | . . . 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 1965 | . 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 2147 Vcvv 3454 ⊆ wss 3900 Tr wtr 5215 TC+ cttc 37452 |
| 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 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-10 2180 ax-11 2197 ax-12 2216 ax-ext 2735 ax-rep 5235 ax-sep 5252 ax-nul 5263 ax-pr 5395 ax-un 7775 ax-inf2 9669 |
| 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 2102 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-ral 3081 df-rex 3091 df-reu 3370 df-rab 3417 df-v 3456 df-sbc 3743 df-csb 3852 df-ss 3901 df-pss 4017 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-op 4839 df-uni 4871 df-iun 4956 df-br 5107 df-opab 5171 df-mpt 5190 df-tr 5216 df-id 5550 df-eprel 5555 df-po 5563 df-so 5564 df-fr 5608 df-we 5610 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-rn 5666 df-res 5667 df-ima 5668 df-pred 6322 df-ord 6383 df-on 6384 df-lim 6385 df-suc 6386 df-iota 6512 df-fun 6560 df-fn 6561 df-f 6562 df-f1 6563 df-fo 6564 df-f1o 6565 df-fv 6566 df-ov 7446 df-om 7902 df-2nd 8026 df-frecs 8327 df-wrecs 8358 df-recs 8407 df-rdg 8446 df-ttc 37453 |
| This theorem is used by: ttcexbi 37499 dfttc3g 37500 |
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