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Theorem setsvalg 17258
Description: Value of the structure replacement function. (Contributed by Mario Carneiro, 30-Apr-2015.)
Assertion
Ref Expression
setsvalg ((𝑆𝑉𝐴𝑊) → (𝑆 sSet 𝐴) = ((𝑆 ↾ (V ∖ dom {𝐴})) ∪ {𝐴}))

Proof of Theorem setsvalg
Dummy variables 𝑒 𝑠 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 elex 3471 . 2 (𝑆𝑉𝑆 ∈ V)
2 elex 3471 . 2 (𝐴𝑊𝐴 ∈ V)
3 resexg 6020 . . . . 5 (𝑆 ∈ V → (𝑆 ↾ (V ∖ dom {𝐴})) ∈ V)
43adantr 486 . . . 4 ((𝑆 ∈ V ∧ 𝐴 ∈ V) → (𝑆 ↾ (V ∖ dom {𝐴})) ∈ V)
5 snex 5404 . . . 4 {𝐴} ∈ V
6 unexg 7745 . . . 4 (((𝑆 ↾ (V ∖ dom {𝐴})) ∈ V ∧ {𝐴} ∈ V) → ((𝑆 ↾ (V ∖ dom {𝐴})) ∪ {𝐴}) ∈ V)
74, 5, 6sylancl 598 . . 3 ((𝑆 ∈ V ∧ 𝐴 ∈ V) → ((𝑆 ↾ (V ∖ dom {𝐴})) ∪ {𝐴}) ∈ V)
8 simpl 488 . . . . . 6 ((𝑠 = 𝑆𝑒 = 𝐴) → 𝑠 = 𝑆)
9 simpr 490 . . . . . . . . 9 ((𝑠 = 𝑆𝑒 = 𝐴) → 𝑒 = 𝐴)
109sneqd 4596 . . . . . . . 8 ((𝑠 = 𝑆𝑒 = 𝐴) → {𝑒} = {𝐴})
1110dmeqd 5889 . . . . . . 7 ((𝑠 = 𝑆𝑒 = 𝐴) → dom {𝑒} = dom {𝐴})
1211difeq2d 4074 . . . . . 6 ((𝑠 = 𝑆𝑒 = 𝐴) → (V ∖ dom {𝑒}) = (V ∖ dom {𝐴}))
138, 12reseq12d 5973 . . . . 5 ((𝑠 = 𝑆𝑒 = 𝐴) → (𝑠 ↾ (V ∖ dom {𝑒})) = (𝑆 ↾ (V ∖ dom {𝐴})))
1413, 10uneq12d 4116 . . . 4 ((𝑠 = 𝑆𝑒 = 𝐴) → ((𝑠 ↾ (V ∖ dom {𝑒})) ∪ {𝑒}) = ((𝑆 ↾ (V ∖ dom {𝐴})) ∪ {𝐴}))
15 df-sets 17256 . . . 4 sSet = (𝑠 ∈ V, 𝑒 ∈ V ↦ ((𝑠 ↾ (V ∖ dom {𝑒})) ∪ {𝑒}))
1614, 15ovmpoga 7567 . . 3 ((𝑆 ∈ V ∧ 𝐴 ∈ V ∧ ((𝑆 ↾ (V ∖ dom {𝐴})) ∪ {𝐴}) ∈ V) → (𝑆 sSet 𝐴) = ((𝑆 ↾ (V ∖ dom {𝐴})) ∪ {𝐴}))
177, 16mpd3an3 1491 . 2 ((𝑆 ∈ V ∧ 𝐴 ∈ V) → (𝑆 sSet 𝐴) = ((𝑆 ↾ (V ∖ dom {𝐴})) ∪ {𝐴}))
181, 2, 17syl2an 608 1 ((𝑆𝑉𝐴𝑊) → (𝑆 sSet 𝐴) = ((𝑆 ↾ (V ∖ dom {𝐴})) ∪ {𝐴}))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  wi 4  wa 401   = wceq 1570  wcel 2145  Vcvv 3450  cdif 3896  cun 3897  {csn 4584  dom cdm 5655  cres 5657  (class class class)co 7413   sSet csts 17255
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 2732  ax-sep 5251  ax-pr 5398  ax-un 7736
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 2564  df-eu 2594  df-clab 2739  df-cleq 2752  df-clel 2835  df-nfc 2909  df-ral 3077  df-rex 3087  df-rab 3413  df-v 3452  df-sbc 3740  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-id 5550  df-xp 5661  df-rel 5662  df-cnv 5663  df-co 5664  df-dm 5665  df-res 5667  df-iota 6489  df-fun 6535  df-fv 6541  df-ov 7416  df-oprab 7417  df-mpo 7418  df-sets 17256
This theorem is used by:  setsval  17259  setsdm  17262  setsfun  17263  setsfun0  17264  wunsets  17269  setsres  17270
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