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Theorem csbrecsg 38219
Description: Move class substitution in and out of recs. (Contributed by ML, 25-Oct-2020.)
Assertion
Ref Expression
csbrecsg (𝐴 ∈ 𝑉 → ⦋𝐴 / 𝑥⦌recs(𝐹) = recs(⦋𝐴 / 𝑥⦌𝐹))

Proof of Theorem csbrecsg
StepHypRef Expression
1 csbwrecsg 8320 . . 3 (𝐴 ∈ 𝑉 → ⦋𝐴 / 𝑥⦌wrecs( E , On, 𝐹) = wrecs(⦋𝐴 / 𝑥⦌ E , ⦋𝐴 / 𝑥⦌On, ⦋𝐴 / 𝑥⦌𝐹))
2 csbconstg 3866 . . . 4 (𝐴 ∈ 𝑉 → ⦋𝐴 / 𝑥⦌ E = E )
3 wrecseq1 8317 . . . 4 (⦋𝐴 / 𝑥⦌ E = E → wrecs(⦋𝐴 / 𝑥⦌ E , ⦋𝐴 / 𝑥⦌On, ⦋𝐴 / 𝑥⦌𝐹) = wrecs( E , ⦋𝐴 / 𝑥⦌On, ⦋𝐴 / 𝑥⦌𝐹))
42, 3syl 18 . . 3 (𝐴 ∈ 𝑉 → wrecs(⦋𝐴 / 𝑥⦌ E , ⦋𝐴 / 𝑥⦌On, ⦋𝐴 / 𝑥⦌𝐹) = wrecs( E , ⦋𝐴 / 𝑥⦌On, ⦋𝐴 / 𝑥⦌𝐹))
5 csbconstg 3866 . . . 4 (𝐴 ∈ 𝑉 → ⦋𝐴 / 𝑥⦌On = On)
6 wrecseq2 8318 . . . 4 (⦋𝐴 / 𝑥⦌On = On → wrecs( E , ⦋𝐴 / 𝑥⦌On, ⦋𝐴 / 𝑥⦌𝐹) = wrecs( E , On, ⦋𝐴 / 𝑥⦌𝐹))
75, 6syl 18 . . 3 (𝐴 ∈ 𝑉 → wrecs( E , ⦋𝐴 / 𝑥⦌On, ⦋𝐴 / 𝑥⦌𝐹) = wrecs( E , On, ⦋𝐴 / 𝑥⦌𝐹))
81, 4, 73eqtrd 2800 . 2 (𝐴 ∈ 𝑉 → ⦋𝐴 / 𝑥⦌wrecs( E , On, 𝐹) = wrecs( E , On, ⦋𝐴 / 𝑥⦌𝐹))
9 df-recs 8363 . . 3 recs(𝐹) = wrecs( E , On, 𝐹)
109csbeq2i 3855 . 2 ⦋𝐴 / 𝑥⦌recs(𝐹) = ⦋𝐴 / 𝑥⦌wrecs( E , On, 𝐹)
11 df-recs 8363 . 2 recs(⦋𝐴 / 𝑥⦌𝐹) = wrecs( E , On, ⦋𝐴 / 𝑥⦌𝐹)
128, 10, 113eqtr4g 2821 1 (𝐴 ∈ 𝑉 → ⦋𝐴 / 𝑥⦌recs(𝐹) = recs(⦋𝐴 / 𝑥⦌𝐹))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   = wceq 1570   ∈ wcel 2145  ⦋csb 3847   E cep 5550  Oncon0 6355  wrecscwrecs 8313  recscrecs 8362
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-10 2178  ax-11 2194  ax-12 2213  ax-ext 2733  ax-sep 5249  ax-nul 5260  ax-pr 5391
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  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-rab 3414  df-v 3453  df-sbc 3740  df-csb 3848  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4280  df-if 4483  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4868  df-br 5104  df-opab 5168  df-xp 5657  df-cnv 5659  df-co 5660  df-dm 5661  df-rn 5662  df-res 5663  df-ima 5664  df-pred 6297  df-iota 6487  df-fv 6539  df-ov 7415  df-frecs 8283  df-wrecs 8314  df-recs 8363
This theorem is used by:  csbrdgg  38220
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