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Theorem tcsni 9693
Description: The transitive closure of a singleton. Proof suggested by Gérard Lang. (Contributed by Mario Carneiro, 4-Jun-2015.)
Hypothesis
Ref Expression
tc2.1 𝐴 ∈ V
Assertion
Ref Expression
tcsni (TC‘{𝐴}) = ((TC‘𝐴) ∪ {𝐴})

Proof of Theorem tcsni
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 tc2.1 . . . . . 6 𝐴 ∈ V
21snss 4742 . . . . 5 (𝐴𝑥 ↔ {𝐴} ⊆ 𝑥)
32anbi1i 633 . . . 4 ((𝐴𝑥 ∧ Tr 𝑥) ↔ ({𝐴} ⊆ 𝑥 ∧ Tr 𝑥))
43abbii 2828 . . 3 {𝑥 ∣ (𝐴𝑥 ∧ Tr 𝑥)} = {𝑥 ∣ ({𝐴} ⊆ 𝑥 ∧ Tr 𝑥)}
54inteqi 4908 . 2 {𝑥 ∣ (𝐴𝑥 ∧ Tr 𝑥)} = {𝑥 ∣ ({𝐴} ⊆ 𝑥 ∧ Tr 𝑥)}
61tc2 9692 . 2 ((TC‘𝐴) ∪ {𝐴}) = {𝑥 ∣ (𝐴𝑥 ∧ Tr 𝑥)}
7 snex 5395 . . 3 {𝐴} ∈ V
8 tcvalg 9688 . . 3 ({𝐴} ∈ V → (TC‘{𝐴}) = {𝑥 ∣ ({𝐴} ⊆ 𝑥 ∧ Tr 𝑥)})
97, 8ax-mp 5 . 2 (TC‘{𝐴}) = {𝑥 ∣ ({𝐴} ⊆ 𝑥 ∧ Tr 𝑥)}
105, 6, 93eqtr4ri 2795 1 (TC‘{𝐴}) = ((TC‘𝐴) ∪ {𝐴})
Colors of variables: wff setvar class
Syntax hints:  wa 399   = wceq 1559  wcel 2141  {cab 2739  Vcvv 3453  cun 3902  wss 3904  {csn 4581   cint 4904  Tr wtr 5206  cfv 6517  TCctc 9686
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1814  ax-4 1828  ax-5 1929  ax-6 1986  ax-7 2027  ax-8 2143  ax-9 2151  ax-10 2174  ax-11 2190  ax-12 2211  ax-ext 2733  ax-rep 5226  ax-sep 5245  ax-nul 5255  ax-pr 5389  ax-un 7714  ax-inf2 9593
This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3or 1098  df-3an 1099  df-tru 1562  df-fal 1572  df-ex 1799  df-nf 1803  df-sb 2090  df-mo 2565  df-eu 2595  df-clab 2740  df-cleq 2753  df-clel 2836  df-nfc 2910  df-ne 2957  df-ral 3076  df-rex 3086  df-reu 3367  df-rab 3414  df-v 3455  df-sbc 3745  df-csb 3853  df-dif 3907  df-un 3909  df-in 3911  df-ss 3921  df-pss 3924  df-nul 4286  df-if 4480  df-pw 4556  df-sn 4582  df-pr 4584  df-op 4588  df-uni 4865  df-int 4905  df-iun 4950  df-iin 4951  df-br 5100  df-opab 5162  df-mpt 5181  df-tr 5207  df-id 5540  df-eprel 5545  df-po 5553  df-so 5554  df-fr 5598  df-we 5600  df-xp 5651  df-rel 5652  df-cnv 5653  df-co 5654  df-dm 5655  df-rn 5656  df-res 5657  df-ima 5658  df-pred 6284  df-ord 6345  df-on 6346  df-lim 6347  df-suc 6348  df-iota 6473  df-fun 6519  df-fn 6520  df-f 6521  df-f1 6522  df-fo 6523  df-f1o 6524  df-fv 6525  df-ov 7395  df-om 7843  df-2nd 7967  df-frecs 8257  df-wrecs 8288  df-recs 8337  df-rdg 8376  df-tc 9687
This theorem is referenced by: (None)
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