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Theorem ressbasid 13152
Description: The trivial structure restriction leaves the base set unchanged. (Contributed by Jim Kingdon, 29-Apr-2025.)
Hypothesis
Ref Expression
ressbasid.b 𝐵 = (Base‘𝑊)
Assertion
Ref Expression
ressbasid (𝑊𝑉 → (Base‘(𝑊s 𝐵)) = 𝐵)

Proof of Theorem ressbasid
StepHypRef Expression
1 eqidd 2232 . . 3 (𝑊𝑉 → (𝑊s 𝐵) = (𝑊s 𝐵))
2 ressbasid.b . . . 4 𝐵 = (Base‘𝑊)
32a1i 9 . . 3 (𝑊𝑉𝐵 = (Base‘𝑊))
4 id 19 . . 3 (𝑊𝑉𝑊𝑉)
5 basfn 13140 . . . . 5 Base Fn V
6 elex 2814 . . . . 5 (𝑊𝑉𝑊 ∈ V)
7 funfvex 5656 . . . . . 6 ((Fun Base ∧ 𝑊 ∈ dom Base) → (Base‘𝑊) ∈ V)
87funfni 5432 . . . . 5 ((Base Fn V ∧ 𝑊 ∈ V) → (Base‘𝑊) ∈ V)
95, 6, 8sylancr 414 . . . 4 (𝑊𝑉 → (Base‘𝑊) ∈ V)
102, 9eqeltrid 2318 . . 3 (𝑊𝑉𝐵 ∈ V)
111, 3, 4, 10ressbasd 13149 . 2 (𝑊𝑉 → (𝐵𝐵) = (Base‘(𝑊s 𝐵)))
12 inidm 3416 . 2 (𝐵𝐵) = 𝐵
1311, 12eqtr3di 2279 1 (𝑊𝑉 → (Base‘(𝑊s 𝐵)) = 𝐵)
Colors of variables: wff set class
Syntax hints:  wi 4   = wceq 1397  wcel 2202  Vcvv 2802  cin 3199   Fn wfn 5321  cfv 5326  (class class class)co 6017  Basecbs 13081  s cress 13082
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 619  ax-in2 620  ax-io 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-sep 4207  ax-pow 4264  ax-pr 4299  ax-un 4530  ax-setind 4635  ax-cnex 8122  ax-resscn 8123  ax-1re 8125  ax-addrcl 8128
This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-fal 1403  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ne 2403  df-ral 2515  df-rex 2516  df-rab 2519  df-v 2804  df-sbc 3032  df-dif 3202  df-un 3204  df-in 3206  df-ss 3213  df-nul 3495  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-int 3929  df-br 4089  df-opab 4151  df-mpt 4152  df-id 4390  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-rn 4736  df-res 4737  df-iota 5286  df-fun 5328  df-fn 5329  df-fv 5334  df-ov 6020  df-oprab 6021  df-mpo 6022  df-inn 9143  df-ndx 13084  df-slot 13085  df-base 13087  df-sets 13088  df-iress 13089
This theorem is referenced by:  rlmscabas  14473
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