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Theorem csbttc 36679
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 3836 . . . 4 (𝑦 = 𝐴𝑦 / 𝑥TC+ 𝐵 = 𝐴 / 𝑥TC+ 𝐵)
2 csbeq1 3836 . . . . 5 (𝑦 = 𝐴𝑦 / 𝑥𝐵 = 𝐴 / 𝑥𝐵)
32ttceqd 36660 . . . 4 (𝑦 = 𝐴 → TC+ 𝑦 / 𝑥𝐵 = TC+ 𝐴 / 𝑥𝐵)
41, 3eqeq12d 2751 . . 3 (𝑦 = 𝐴 → (𝑦 / 𝑥TC+ 𝐵 = TC+ 𝑦 / 𝑥𝐵𝐴 / 𝑥TC+ 𝐵 = TC+ 𝐴 / 𝑥𝐵))
5 vex 3431 . . . 4 𝑦 ∈ V
6 nfcsb1v 3857 . . . . 5 𝑥𝑦 / 𝑥𝐵
76nfttc 36661 . . . 4 𝑥TC+ 𝑦 / 𝑥𝐵
8 csbeq1a 3847 . . . . 5 (𝑥 = 𝑦𝐵 = 𝑦 / 𝑥𝐵)
98ttceqd 36660 . . . 4 (𝑥 = 𝑦 → TC+ 𝐵 = TC+ 𝑦 / 𝑥𝐵)
105, 7, 9csbief 3867 . . 3 𝑦 / 𝑥TC+ 𝐵 = TC+ 𝑦 / 𝑥𝐵
114, 10vtoclg 3497 . 2 (𝐴 ∈ V → 𝐴 / 𝑥TC+ 𝐵 = TC+ 𝐴 / 𝑥𝐵)
12 csbprc 4339 . . 3 𝐴 ∈ V → 𝐴 / 𝑥TC+ 𝐵 = ∅)
13 csbprc 4339 . . . . 5 𝐴 ∈ V → 𝐴 / 𝑥𝐵 = ∅)
1413ttceqd 36660 . . . 4 𝐴 ∈ V → TC+ 𝐴 / 𝑥𝐵 = TC+ ∅)
15 ttc0 36677 . . . 4 TC+ ∅ = ∅
1614, 15eqtrdi 2786 . . 3 𝐴 ∈ V → TC+ 𝐴 / 𝑥𝐵 = ∅)
1712, 16eqtr4d 2773 . 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 3427  csb 3833  c0 4263  TC+ cttc 36656
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 2184  ax-ext 2707  ax-rep 5201  ax-sep 5220  ax-nul 5230  ax-pr 5364  ax-un 7678
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 2538  df-eu 2568  df-clab 2714  df-cleq 2727  df-clel 2810  df-nfc 2884  df-ne 2931  df-ral 3050  df-rex 3060  df-reu 3341  df-rab 3388  df-v 3429  df-sbc 3726  df-csb 3834  df-dif 3888  df-un 3890  df-in 3892  df-ss 3902  df-pss 3905  df-nul 4264  df-if 4457  df-pw 4533  df-sn 4558  df-pr 4560  df-op 4564  df-uni 4841  df-iun 4925  df-br 5075  df-opab 5137  df-mpt 5156  df-tr 5182  df-id 5515  df-eprel 5520  df-po 5528  df-so 5529  df-fr 5573  df-we 5575  df-xp 5626  df-rel 5627  df-cnv 5628  df-co 5629  df-dm 5630  df-rn 5631  df-res 5632  df-ima 5633  df-pred 6254  df-ord 6315  df-on 6316  df-lim 6317  df-suc 6318  df-iota 6443  df-fun 6489  df-fn 6490  df-f 6491  df-f1 6492  df-fo 6493  df-f1o 6494  df-fv 6495  df-ov 7359  df-om 7807  df-2nd 7932  df-frecs 8220  df-wrecs 8251  df-recs 8300  df-rdg 8338  df-ttc 36657
This theorem is referenced by: (None)
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