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Mirrors > Home > MPE Home > Th. List > tcsni | Structured version Visualization version GIF version |
Description: The transitive closure of a singleton. Proof suggested by Gérard Lang. (Contributed by Mario Carneiro, 4-Jun-2015.) |
Ref | Expression |
---|---|
tc2.1 | ⊢ 𝐴 ∈ V |
Ref | Expression |
---|---|
tcsni | ⊢ (TC‘{𝐴}) = ((TC‘𝐴) ∪ {𝐴}) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | tc2.1 | . . . . . 6 ⊢ 𝐴 ∈ V | |
2 | 1 | snss 4716 | . . . . 5 ⊢ (𝐴 ∈ 𝑥 ↔ {𝐴} ⊆ 𝑥) |
3 | 2 | anbi1i 623 | . . . 4 ⊢ ((𝐴 ∈ 𝑥 ∧ Tr 𝑥) ↔ ({𝐴} ⊆ 𝑥 ∧ Tr 𝑥)) |
4 | 3 | abbii 2809 | . . 3 ⊢ {𝑥 ∣ (𝐴 ∈ 𝑥 ∧ Tr 𝑥)} = {𝑥 ∣ ({𝐴} ⊆ 𝑥 ∧ Tr 𝑥)} |
5 | 4 | inteqi 4880 | . 2 ⊢ ∩ {𝑥 ∣ (𝐴 ∈ 𝑥 ∧ Tr 𝑥)} = ∩ {𝑥 ∣ ({𝐴} ⊆ 𝑥 ∧ Tr 𝑥)} |
6 | 1 | tc2 9431 | . 2 ⊢ ((TC‘𝐴) ∪ {𝐴}) = ∩ {𝑥 ∣ (𝐴 ∈ 𝑥 ∧ Tr 𝑥)} |
7 | snex 5349 | . . 3 ⊢ {𝐴} ∈ V | |
8 | tcvalg 9427 | . . 3 ⊢ ({𝐴} ∈ V → (TC‘{𝐴}) = ∩ {𝑥 ∣ ({𝐴} ⊆ 𝑥 ∧ Tr 𝑥)}) | |
9 | 7, 8 | ax-mp 5 | . 2 ⊢ (TC‘{𝐴}) = ∩ {𝑥 ∣ ({𝐴} ⊆ 𝑥 ∧ Tr 𝑥)} |
10 | 5, 6, 9 | 3eqtr4ri 2777 | 1 ⊢ (TC‘{𝐴}) = ((TC‘𝐴) ∪ {𝐴}) |
Colors of variables: wff setvar class |
Syntax hints: ∧ wa 395 = wceq 1539 ∈ wcel 2108 {cab 2715 Vcvv 3422 ∪ cun 3881 ⊆ wss 3883 {csn 4558 ∩ cint 4876 Tr wtr 5187 ‘cfv 6418 TCctc 9425 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1799 ax-4 1813 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2110 ax-9 2118 ax-10 2139 ax-11 2156 ax-12 2173 ax-ext 2709 ax-rep 5205 ax-sep 5218 ax-nul 5225 ax-pr 5347 ax-un 7566 ax-inf2 9329 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1784 df-nf 1788 df-sb 2069 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2817 df-nfc 2888 df-ne 2943 df-ral 3068 df-rex 3069 df-reu 3070 df-rab 3072 df-v 3424 df-sbc 3712 df-csb 3829 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-pss 3902 df-nul 4254 df-if 4457 df-pw 4532 df-sn 4559 df-pr 4561 df-tp 4563 df-op 4565 df-uni 4837 df-int 4877 df-iun 4923 df-iin 4924 df-br 5071 df-opab 5133 df-mpt 5154 df-tr 5188 df-id 5480 df-eprel 5486 df-po 5494 df-so 5495 df-fr 5535 df-we 5537 df-xp 5586 df-rel 5587 df-cnv 5588 df-co 5589 df-dm 5590 df-rn 5591 df-res 5592 df-ima 5593 df-pred 6191 df-ord 6254 df-on 6255 df-lim 6256 df-suc 6257 df-iota 6376 df-fun 6420 df-fn 6421 df-f 6422 df-f1 6423 df-fo 6424 df-f1o 6425 df-fv 6426 df-ov 7258 df-om 7688 df-2nd 7805 df-frecs 8068 df-wrecs 8099 df-recs 8173 df-rdg 8212 df-tc 9426 |
This theorem is referenced by: (None) |
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