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Theorem inintabd 43592
Description: Value of the intersection of class with the intersection of a nonempty class. (Contributed by RP, 13-Aug-2020.)
Hypothesis
Ref Expression
inintabd.x (𝜑 → ∃𝑥𝜓)
Assertion
Ref Expression
inintabd (𝜑 → (𝐴 {𝑥𝜓}) = {𝑤 ∈ 𝒫 𝐴 ∣ ∃𝑥(𝑤 = (𝐴𝑥) ∧ 𝜓)})
Distinct variable groups:   𝜓,𝑤   𝑥,𝑤,𝐴
Allowed substitution hints:   𝜑(𝑥,𝑤)   𝜓(𝑥)

Proof of Theorem inintabd
Dummy variable 𝑢 is distinct from all other variables.
StepHypRef Expression
1 inintabd.x . . . . . 6 (𝜑 → ∃𝑥𝜓)
2 pm5.5 361 . . . . . 6 (∃𝑥𝜓 → ((∃𝑥𝜓𝑢𝐴) ↔ 𝑢𝐴))
31, 2syl 17 . . . . 5 (𝜑 → ((∃𝑥𝜓𝑢𝐴) ↔ 𝑢𝐴))
43bicomd 223 . . . 4 (𝜑 → (𝑢𝐴 ↔ (∃𝑥𝜓𝑢𝐴)))
54anbi1d 631 . . 3 (𝜑 → ((𝑢𝐴 ∧ ∀𝑥(𝜓𝑢𝑥)) ↔ ((∃𝑥𝜓𝑢𝐴) ∧ ∀𝑥(𝜓𝑢𝑥))))
6 elinintab 43588 . . 3 (𝑢 ∈ (𝐴 {𝑥𝜓}) ↔ (𝑢𝐴 ∧ ∀𝑥(𝜓𝑢𝑥)))
7 elinintrab 43590 . . . 4 (𝑢 ∈ V → (𝑢 {𝑤 ∈ 𝒫 𝐴 ∣ ∃𝑥(𝑤 = (𝐴𝑥) ∧ 𝜓)} ↔ ((∃𝑥𝜓𝑢𝐴) ∧ ∀𝑥(𝜓𝑢𝑥))))
87elv 3485 . . 3 (𝑢 {𝑤 ∈ 𝒫 𝐴 ∣ ∃𝑥(𝑤 = (𝐴𝑥) ∧ 𝜓)} ↔ ((∃𝑥𝜓𝑢𝐴) ∧ ∀𝑥(𝜓𝑢𝑥)))
95, 6, 83bitr4g 314 . 2 (𝜑 → (𝑢 ∈ (𝐴 {𝑥𝜓}) ↔ 𝑢 {𝑤 ∈ 𝒫 𝐴 ∣ ∃𝑥(𝑤 = (𝐴𝑥) ∧ 𝜓)}))
109eqrdv 2735 1 (𝜑 → (𝐴 {𝑥𝜓}) = {𝑤 ∈ 𝒫 𝐴 ∣ ∃𝑥(𝑤 = (𝐴𝑥) ∧ 𝜓)})
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 206  wa 395  wal 1538   = wceq 1540  wex 1779  wcel 2108  {cab 2714  {crab 3436  Vcvv 3480  cin 3950  𝒫 cpw 4600   cint 4946
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-10 2141  ax-11 2157  ax-12 2177  ax-ext 2708  ax-sep 5296
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-tru 1543  df-ex 1780  df-nf 1784  df-sb 2065  df-clab 2715  df-cleq 2729  df-clel 2816  df-ral 3062  df-rex 3071  df-rab 3437  df-v 3482  df-in 3958  df-ss 3968  df-pw 4602  df-int 4947
This theorem is referenced by:  xpinintabd  43593
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