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Theorem csbttc 36697
Description: Distribute proper substitution through a transitive closure. (Contributed by Matthew House, 6-Apr-2026.)
Assertion
Ref Expression
csbttc 𝐴 / 𝑥TC+ 𝐵 = TC+ 𝐴 / 𝑥𝐵

Proof of Theorem csbttc
Dummy variable 𝑦 is distinct from all other variables.
StepHypRef Expression
1 csbeq1 3841 . . . 4 (𝑦 = 𝐴𝑦 / 𝑥TC+ 𝐵 = 𝐴 / 𝑥TC+ 𝐵)
2 csbeq1 3841 . . . . 5 (𝑦 = 𝐴𝑦 / 𝑥𝐵 = 𝐴 / 𝑥𝐵)
32ttceqd 36678 . . . 4 (𝑦 = 𝐴 → TC+ 𝑦 / 𝑥𝐵 = TC+ 𝐴 / 𝑥𝐵)
41, 3eqeq12d 2753 . . 3 (𝑦 = 𝐴 → (𝑦 / 𝑥TC+ 𝐵 = TC+ 𝑦 / 𝑥𝐵𝐴 / 𝑥TC+ 𝐵 = TC+ 𝐴 / 𝑥𝐵))
5 vex 3434 . . . 4 𝑦 ∈ V
6 nfcsb1v 3862 . . . . 5 𝑥𝑦 / 𝑥𝐵
76nfttc 36679 . . . 4 𝑥TC+ 𝑦 / 𝑥𝐵
8 csbeq1a 3852 . . . . 5 (𝑥 = 𝑦𝐵 = 𝑦 / 𝑥𝐵)
98ttceqd 36678 . . . 4 (𝑥 = 𝑦 → TC+ 𝐵 = TC+ 𝑦 / 𝑥𝐵)
105, 7, 9csbief 3872 . . 3 𝑦 / 𝑥TC+ 𝐵 = TC+ 𝑦 / 𝑥𝐵
114, 10vtoclg 3500 . 2 (𝐴 ∈ V → 𝐴 / 𝑥TC+ 𝐵 = TC+ 𝐴 / 𝑥𝐵)
12 csbprc 4350 . . 3 𝐴 ∈ V → 𝐴 / 𝑥TC+ 𝐵 = ∅)
13 csbprc 4350 . . . . 5 𝐴 ∈ V → 𝐴 / 𝑥𝐵 = ∅)
1413ttceqd 36678 . . . 4 𝐴 ∈ V → TC+ 𝐴 / 𝑥𝐵 = TC+ ∅)
15 ttc0 36695 . . . 4 TC+ ∅ = ∅
1614, 15eqtrdi 2788 . . 3 𝐴 ∈ V → TC+ 𝐴 / 𝑥𝐵 = ∅)
1712, 16eqtr4d 2775 . 2 𝐴 ∈ V → 𝐴 / 𝑥TC+ 𝐵 = TC+ 𝐴 / 𝑥𝐵)
1811, 17pm2.61i 182 1 𝐴 / 𝑥TC+ 𝐵 = TC+ 𝐴 / 𝑥𝐵
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3   = wceq 1542  wcel 2114  Vcvv 3430  csb 3838  c0 4274  TC+ cttc 36674
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2709  ax-rep 5212  ax-sep 5231  ax-nul 5241  ax-pr 5368  ax-un 7680
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3or 1088  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2540  df-eu 2570  df-clab 2716  df-cleq 2729  df-clel 2812  df-nfc 2886  df-ne 2934  df-ral 3053  df-rex 3063  df-reu 3344  df-rab 3391  df-v 3432  df-sbc 3730  df-csb 3839  df-dif 3893  df-un 3895  df-in 3897  df-ss 3907  df-pss 3910  df-nul 4275  df-if 4468  df-pw 4544  df-sn 4569  df-pr 4571  df-op 4575  df-uni 4852  df-iun 4936  df-br 5087  df-opab 5149  df-mpt 5168  df-tr 5194  df-id 5517  df-eprel 5522  df-po 5530  df-so 5531  df-fr 5575  df-we 5577  df-xp 5628  df-rel 5629  df-cnv 5630  df-co 5631  df-dm 5632  df-rn 5633  df-res 5634  df-ima 5635  df-pred 6257  df-ord 6318  df-on 6319  df-lim 6320  df-suc 6321  df-iota 6446  df-fun 6492  df-fn 6493  df-f 6494  df-f1 6495  df-fo 6496  df-f1o 6497  df-fv 6498  df-ov 7361  df-om 7809  df-2nd 7934  df-frecs 8222  df-wrecs 8253  df-recs 8302  df-rdg 8340  df-ttc 36675
This theorem is referenced by: (None)
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