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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 4718 | . . . . 5 ⊢ (𝐴 ∈ 𝑥 ↔ {𝐴} ⊆ 𝑥) |
3 | 2 | anbi1i 625 | . . . 4 ⊢ ((𝐴 ∈ 𝑥 ∧ Tr 𝑥) ↔ ({𝐴} ⊆ 𝑥 ∧ Tr 𝑥)) |
4 | 3 | abbii 2886 | . . 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 9184 | . 2 ⊢ ((TC‘𝐴) ∪ {𝐴}) = ∩ {𝑥 ∣ (𝐴 ∈ 𝑥 ∧ Tr 𝑥)} |
7 | snex 5332 | . . 3 ⊢ {𝐴} ∈ V | |
8 | tcvalg 9180 | . . 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 2855 | 1 ⊢ (TC‘{𝐴}) = ((TC‘𝐴) ∪ {𝐴}) |
Colors of variables: wff setvar class |
Syntax hints: ∧ wa 398 = wceq 1537 ∈ wcel 2114 {cab 2799 Vcvv 3494 ∪ cun 3934 ⊆ wss 3936 {csn 4567 ∩ cint 4876 Tr wtr 5172 ‘cfv 6355 TCctc 9178 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 ax-rep 5190 ax-sep 5203 ax-nul 5210 ax-pow 5266 ax-pr 5330 ax-un 7461 ax-inf2 9104 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-ral 3143 df-rex 3144 df-reu 3145 df-rab 3147 df-v 3496 df-sbc 3773 df-csb 3884 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-pss 3954 df-nul 4292 df-if 4468 df-pw 4541 df-sn 4568 df-pr 4570 df-tp 4572 df-op 4574 df-uni 4839 df-int 4877 df-iun 4921 df-iin 4922 df-br 5067 df-opab 5129 df-mpt 5147 df-tr 5173 df-id 5460 df-eprel 5465 df-po 5474 df-so 5475 df-fr 5514 df-we 5516 df-xp 5561 df-rel 5562 df-cnv 5563 df-co 5564 df-dm 5565 df-rn 5566 df-res 5567 df-ima 5568 df-pred 6148 df-ord 6194 df-on 6195 df-lim 6196 df-suc 6197 df-iota 6314 df-fun 6357 df-fn 6358 df-f 6359 df-f1 6360 df-fo 6361 df-f1o 6362 df-fv 6363 df-om 7581 df-wrecs 7947 df-recs 8008 df-rdg 8046 df-tc 9179 |
This theorem is referenced by: (None) |
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