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Theorem restsubel 46262
Description: A subset belongs in the space it generates via restriction. (Contributed by Glauco Siliprandi, 21-Dec-2024.)
Hypotheses
Ref Expression
restsubel.1 (𝜑 → 𝐽 ∈ 𝑉)
restsubel.2 (𝜑 → ∪ 𝐽 ∈ 𝐽)
restsubel.3 (𝜑 → 𝐴 ⊆ ∪ 𝐽)
Assertion
Ref Expression
restsubel (𝜑 → 𝐴 ∈ (𝐽 ↾t 𝐴))

Proof of Theorem restsubel
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 restsubel.2 . . 3 (𝜑 → ∪ 𝐽 ∈ 𝐽)
2 ineq1 4110 . . . . 5 (𝑥 = ∪ 𝐽 → (𝑥 ∩ 𝐴) = (∪ 𝐽 ∩ 𝐴))
32eqeq2d 2771 . . . 4 (𝑥 = ∪ 𝐽 → (𝐴 = (𝑥 ∩ 𝐴) ↔ 𝐴 = (∪ 𝐽 ∩ 𝐴)))
43adantl 487 . . 3 ((𝜑 ∧ 𝑥 = ∪ 𝐽) → (𝐴 = (𝑥 ∩ 𝐴) ↔ 𝐴 = (∪ 𝐽 ∩ 𝐴)))
5 incom 4106 . . . . . 6 (∪ 𝐽 ∩ 𝐴) = (𝐴 ∩ ∪ 𝐽)
65a1i 11 . . . . 5 (𝜑 → (∪ 𝐽 ∩ 𝐴) = (𝐴 ∩ ∪ 𝐽))
7 restsubel.3 . . . . . 6 (𝜑 → 𝐴 ⊆ ∪ 𝐽)
8 dfss2 4094 . . . . . 6 (𝐴 ⊆ ∪ 𝐽 ↔ (𝐴 ∩ ∪ 𝐽) = 𝐴)
97, 8sylib 221 . . . . 5 (𝜑 → (𝐴 ∩ ∪ 𝐽) = 𝐴)
106, 9eqtrd 2795 . . . 4 (𝜑 → (∪ 𝐽 ∩ 𝐴) = 𝐴)
1110eqcomd 2766 . . 3 (𝜑 → 𝐴 = (∪ 𝐽 ∩ 𝐴))
121, 4, 11rspcedvd 3578 . 2 (𝜑 → ∃𝑥 ∈ 𝐽 𝐴 = (𝑥 ∩ 𝐴))
13 restsubel.1 . . 3 (𝜑 → 𝐽 ∈ 𝑉)
141, 7ssexd 5285 . . 3 (𝜑 → 𝐴 ∈ V)
15 elrest 17604 . . 3 ((𝐽 ∈ 𝑉 ∧ 𝐴 ∈ V) → (𝐴 ∈ (𝐽 ↾t 𝐴) ↔ ∃𝑥 ∈ 𝐽 𝐴 = (𝑥 ∩ 𝐴)))
1613, 14, 15syl2anc 596 . 2 (𝜑 → (𝐴 ∈ (𝐽 ↾t 𝐴) ↔ ∃𝑥 ∈ 𝐽 𝐴 = (𝑥 ∩ 𝐴)))
1712, 16mpbird 260 1 (𝜑 → 𝐴 ∈ (𝐽 ↾t 𝐴))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   ↔ wb 209   = wceq 1569   ∈ wcel 2144  ∃wrex 3086  Vcvv 3450   ⊆ wss 3895   ∩ cin 4089  ∪ cuni 4866  (class class class)co 7421   ↾t crest 17597
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1942  ax-6 1999  ax-7 2040  ax-8 2146  ax-9 2154  ax-10 2177  ax-11 2193  ax-12 2212  ax-ext 2732  ax-rep 5231  ax-sep 5248  ax-nul 5259  ax-pr 5390  ax-un 7752
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-nf 1816  df-sb 2099  df-mo 2564  df-eu 2594  df-clab 2739  df-cleq 2752  df-clel 2835  df-nfc 2909  df-ne 2956  df-ral 3077  df-rex 3087  df-reu 3366  df-rab 3413  df-v 3452  df-sbc 3739  df-csb 3847  df-ss 3896  df-dif 4047  df-in 4091  df-un 4151  df-nul 4279  df-if 4482  df-sn 4585  df-pr 4587  df-op 4835  df-uni 4867  df-iun 4952  df-br 5103  df-opab 5167  df-mpt 5186  df-id 5545  df-xp 5656  df-rel 5657  df-cnv 5658  df-co 5659  df-dm 5660  df-rn 5661  df-res 5662  df-ima 5663  df-iota 6494  df-fun 6541  df-fn 6542  df-f 6543  df-f1 6544  df-fo 6545  df-f1o 6546  df-fv 6547  df-ov 7424  df-oprab 7425  df-mpo 7426  df-rest 17599
This theorem is used by:  toprestsubel  46263
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