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Theorem ressbasid 13367
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 2235 . . 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 13355 . . . . 5 Base Fn V
6 elex 2827 . . . . 5 (𝑊𝑉𝑊 ∈ V)
7 funfvex 5692 . . . . . 6 ((Fun Base ∧ 𝑊 ∈ dom Base) → (Base‘𝑊) ∈ V)
87funfni 5463 . . . . 5 ((Base Fn V ∧ 𝑊 ∈ V) → (Base‘𝑊) ∈ V)
95, 6, 8sylancr 414 . . . 4 (𝑊𝑉 → (Base‘𝑊) ∈ V)
102, 9eqeltrid 2321 . . 3 (𝑊𝑉𝐵 ∈ V)
111, 3, 4, 10ressbasd 13364 . 2 (𝑊𝑉 → (𝐵𝐵) = (Base‘(𝑊s 𝐵)))
12 inidm 3434 . 2 (𝐵𝐵) = 𝐵
1311, 12eqtr3di 2282 1 (𝑊𝑉 → (Base‘(𝑊s 𝐵)) = 𝐵)
Colors of variables: wff set class
Syntax hints:  wi 4   = wceq 1398  wcel 2205  Vcvv 2815  cin 3213   Fn wfn 5352  cfv 5357  (class class class)co 6058  Basecbs 13296  s cress 13297
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 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2207  ax-14 2208  ax-ext 2216  ax-sep 4233  ax-pow 4292  ax-pr 4327  ax-un 4559  ax-setind 4664  ax-cnex 8234  ax-resscn 8235  ax-1re 8237  ax-addrcl 8240
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ne 2415  df-ral 2527  df-rex 2528  df-rab 2531  df-v 2817  df-sbc 3046  df-dif 3216  df-un 3218  df-in 3220  df-ss 3227  df-nul 3513  df-pw 3676  df-sn 3700  df-pr 3701  df-op 3703  df-uni 3920  df-int 3955  df-br 4115  df-opab 4177  df-mpt 4178  df-id 4419  df-xp 4760  df-rel 4761  df-cnv 4762  df-co 4763  df-dm 4764  df-rn 4765  df-res 4766  df-iota 5317  df-fun 5359  df-fn 5360  df-fv 5365  df-ov 6061  df-oprab 6062  df-mpo 6063  df-inn 9255  df-ndx 13299  df-slot 13300  df-base 13302  df-sets 13303  df-iress 13304
This theorem is referenced by:  rlmscabas  14734
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