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Theorem csbttc 37048
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 3855 . . . 4 (𝑦 = 𝐴𝑦 / 𝑥TC+ 𝐵 = 𝐴 / 𝑥TC+ 𝐵)
2 csbeq1 3855 . . . . 5 (𝑦 = 𝐴𝑦 / 𝑥𝐵 = 𝐴 / 𝑥𝐵)
32ttceqd 37029 . . . 4 (𝑦 = 𝐴 → TC+ 𝑦 / 𝑥𝐵 = TC+ 𝐴 / 𝑥𝐵)
41, 3eqeq12d 2778 . . 3 (𝑦 = 𝐴 → (𝑦 / 𝑥TC+ 𝐵 = TC+ 𝑦 / 𝑥𝐵𝐴 / 𝑥TC+ 𝐵 = TC+ 𝐴 / 𝑥𝐵))
5 vex 3458 . . . 4 𝑦 ∈ V
6 nfcsb1v 3876 . . . . 5 𝑥𝑦 / 𝑥𝐵
76nfttc 37030 . . . 4 𝑥TC+ 𝑦 / 𝑥𝐵
8 csbeq1a 3866 . . . . 5 (𝑥 = 𝑦𝐵 = 𝑦 / 𝑥𝐵)
98ttceqd 37029 . . . 4 (𝑥 = 𝑦 → TC+ 𝐵 = TC+ 𝑦 / 𝑥𝐵)
105, 7, 9csbief 3886 . . 3 𝑦 / 𝑥TC+ 𝐵 = TC+ 𝑦 / 𝑥𝐵
114, 10vtoclg 3521 . 2 (𝐴 ∈ V → 𝐴 / 𝑥TC+ 𝐵 = TC+ 𝐴 / 𝑥𝐵)
12 csbprc 4373 . . 3 𝐴 ∈ V → 𝐴 / 𝑥TC+ 𝐵 = ∅)
13 csbprc 4373 . . . . 5 𝐴 ∈ V → 𝐴 / 𝑥𝐵 = ∅)
1413ttceqd 37029 . . . 4 𝐴 ∈ V → TC+ 𝐴 / 𝑥𝐵 = TC+ ∅)
15 ttc0 37046 . . . 4 TC+ ∅ = ∅
1614, 15eqtrdi 2813 . . 3 𝐴 ∈ V → TC+ 𝐴 / 𝑥𝐵 = ∅)
1712, 16eqtr4d 2800 . 2 𝐴 ∈ V → 𝐴 / 𝑥TC+ 𝐵 = TC+ 𝐴 / 𝑥𝐵)
1811, 17pm2.61i 184 1 𝐴 / 𝑥TC+ 𝐵 = TC+ 𝐴 / 𝑥𝐵
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  ¬ wn 3   = wceq 1569  wcel 2142  Vcvv 3454  csb 3852  c0 4285  TC+ cttc 37025
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1824  ax-4 1838  ax-5 1939  ax-6 1996  ax-7 2037  ax-8 2144  ax-9 2152  ax-10 2175  ax-11 2191  ax-12 2212  ax-ext 2734  ax-rep 5237  ax-sep 5256  ax-nul 5268  ax-pr 5403  ax-un 7734
This proof depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3or 1103  df-3an 1104  df-tru 1572  df-fal 1582  df-ex 1809  df-nf 1813  df-sb 2096  df-mo 2566  df-eu 2596  df-clab 2741  df-cleq 2754  df-clel 2837  df-nfc 2911  df-ne 2958  df-ral 3079  df-rex 3089  df-reu 3369  df-rab 3416  df-v 3456  df-sbc 3744  df-csb 3853  df-dif 3907  df-un 3909  df-in 3911  df-ss 3921  df-pss 3924  df-nul 4286  df-if 4487  df-pw 4563  df-sn 4589  df-pr 4591  df-op 4595  df-uni 4872  df-iun 4957  df-br 5109  df-opab 5173  df-mpt 5192  df-tr 5218  df-id 5555  df-eprel 5560  df-po 5568  df-so 5569  df-fr 5613  df-we 5615  df-xp 5666  df-rel 5667  df-cnv 5668  df-co 5669  df-dm 5670  df-rn 5671  df-res 5672  df-ima 5673  df-pred 6302  df-ord 6363  df-on 6364  df-lim 6365  df-suc 6366  df-iota 6492  df-fun 6538  df-fn 6539  df-f 6540  df-f1 6541  df-fo 6542  df-f1o 6543  df-fv 6544  df-ov 7415  df-om 7861  df-2nd 7985  df-frecs 8276  df-wrecs 8307  df-recs 8356  df-rdg 8395  df-ttc 37026
This theorem is used by: (None)
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