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Theorem csbttc 36964
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 36945 . . . 4 (𝑦 = 𝐴 → TC+ 𝑦 / 𝑥𝐵 = TC+ 𝐴 / 𝑥𝐵)
41, 3eqeq12d 2777 . . 3 (𝑦 = 𝐴 → (𝑦 / 𝑥TC+ 𝐵 = TC+ 𝑦 / 𝑥𝐵𝐴 / 𝑥TC+ 𝐵 = TC+ 𝐴 / 𝑥𝐵))
5 vex 3457 . . . 4 𝑦 ∈ V
6 nfcsb1v 3876 . . . . 5 𝑥𝑦 / 𝑥𝐵
76nfttc 36946 . . . 4 𝑥TC+ 𝑦 / 𝑥𝐵
8 csbeq1a 3866 . . . . 5 (𝑥 = 𝑦𝐵 = 𝑦 / 𝑥𝐵)
98ttceqd 36945 . . . 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 36945 . . . 4 𝐴 ∈ V → TC+ 𝐴 / 𝑥𝐵 = TC+ ∅)
15 ttc0 36962 . . . 4 TC+ ∅ = ∅
1614, 15eqtrdi 2812 . . 3 𝐴 ∈ V → TC+ 𝐴 / 𝑥𝐵 = ∅)
1712, 16eqtr4d 2799 . 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
Syntax hints:  ¬ wn 3   = wceq 1568  wcel 2141  Vcvv 3453  csb 3852  c0 4285  TC+ cttc 36941
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1823  ax-4 1837  ax-5 1938  ax-6 1995  ax-7 2036  ax-8 2143  ax-9 2151  ax-10 2174  ax-11 2190  ax-12 2211  ax-ext 2733  ax-rep 5237  ax-sep 5256  ax-nul 5268  ax-pr 5404  ax-un 7732
This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3or 1102  df-3an 1103  df-tru 1571  df-fal 1581  df-ex 1808  df-nf 1812  df-sb 2095  df-mo 2565  df-eu 2595  df-clab 2740  df-cleq 2753  df-clel 2836  df-nfc 2910  df-ne 2957  df-ral 3078  df-rex 3088  df-reu 3368  df-rab 3415  df-v 3455  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 5556  df-eprel 5561  df-po 5569  df-so 5570  df-fr 5614  df-we 5616  df-xp 5667  df-rel 5668  df-cnv 5669  df-co 5670  df-dm 5671  df-rn 5672  df-res 5673  df-ima 5674  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 7413  df-om 7862  df-2nd 7986  df-frecs 8277  df-wrecs 8308  df-recs 8357  df-rdg 8396  df-ttc 36942
This theorem is referenced by: (None)
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