Users' Mathboxes Mathbox for Richard Penner < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >   Mathboxes  >  elintima Structured version   Visualization version   GIF version

Theorem elintima 38439
Description: Element of intersection of images. (Contributed by RP, 13-Apr-2020.)
Assertion
Ref Expression
elintima (𝑦 {𝑥 ∣ ∃𝑎𝐴 𝑥 = (𝑎𝐵)} ↔ ∀𝑎𝐴𝑏𝐵𝑏, 𝑦⟩ ∈ 𝑎)
Distinct variable groups:   𝑥,𝐴   𝑥,𝐵   𝑦,𝑎   𝐵,𝑏   𝑎,𝑏,𝑥,𝑦
Allowed substitution hints:   𝐴(𝑦,𝑎,𝑏)   𝐵(𝑦,𝑎)

Proof of Theorem elintima
Dummy variable 𝑧 is distinct from all other variables.
StepHypRef Expression
1 vex 3335 . . 3 𝑦 ∈ V
21elint2 4626 . 2 (𝑦 {𝑥 ∣ ∃𝑎𝐴 𝑥 = (𝑎𝐵)} ↔ ∀𝑧 ∈ {𝑥 ∣ ∃𝑎𝐴 𝑥 = (𝑎𝐵)}𝑦𝑧)
3 elequ2 2145 . . . 4 (𝑧 = 𝑥 → (𝑦𝑧𝑦𝑥))
43ralab2 3504 . . 3 (∀𝑧 ∈ {𝑥 ∣ ∃𝑎𝐴 𝑥 = (𝑎𝐵)}𝑦𝑧 ↔ ∀𝑥(∃𝑎𝐴 𝑥 = (𝑎𝐵) → 𝑦𝑥))
5 df-rex 3048 . . . . . . 7 (∃𝑎𝐴 𝑥 = (𝑎𝐵) ↔ ∃𝑎(𝑎𝐴𝑥 = (𝑎𝐵)))
65imbi1i 338 . . . . . 6 ((∃𝑎𝐴 𝑥 = (𝑎𝐵) → 𝑦𝑥) ↔ (∃𝑎(𝑎𝐴𝑥 = (𝑎𝐵)) → 𝑦𝑥))
7 19.23v 2012 . . . . . 6 (∀𝑎((𝑎𝐴𝑥 = (𝑎𝐵)) → 𝑦𝑥) ↔ (∃𝑎(𝑎𝐴𝑥 = (𝑎𝐵)) → 𝑦𝑥))
8 simpr 479 . . . . . . . . . 10 ((𝑎𝐴𝑥 = (𝑎𝐵)) → 𝑥 = (𝑎𝐵))
98eleq2d 2817 . . . . . . . . 9 ((𝑎𝐴𝑥 = (𝑎𝐵)) → (𝑦𝑥𝑦 ∈ (𝑎𝐵)))
109pm5.74i 260 . . . . . . . 8 (((𝑎𝐴𝑥 = (𝑎𝐵)) → 𝑦𝑥) ↔ ((𝑎𝐴𝑥 = (𝑎𝐵)) → 𝑦 ∈ (𝑎𝐵)))
111elima 5621 . . . . . . . . . 10 (𝑦 ∈ (𝑎𝐵) ↔ ∃𝑏𝐵 𝑏𝑎𝑦)
12 df-br 4797 . . . . . . . . . . 11 (𝑏𝑎𝑦 ↔ ⟨𝑏, 𝑦⟩ ∈ 𝑎)
1312rexbii 3171 . . . . . . . . . 10 (∃𝑏𝐵 𝑏𝑎𝑦 ↔ ∃𝑏𝐵𝑏, 𝑦⟩ ∈ 𝑎)
1411, 13bitri 264 . . . . . . . . 9 (𝑦 ∈ (𝑎𝐵) ↔ ∃𝑏𝐵𝑏, 𝑦⟩ ∈ 𝑎)
1514imbi2i 325 . . . . . . . 8 (((𝑎𝐴𝑥 = (𝑎𝐵)) → 𝑦 ∈ (𝑎𝐵)) ↔ ((𝑎𝐴𝑥 = (𝑎𝐵)) → ∃𝑏𝐵𝑏, 𝑦⟩ ∈ 𝑎))
1610, 15bitri 264 . . . . . . 7 (((𝑎𝐴𝑥 = (𝑎𝐵)) → 𝑦𝑥) ↔ ((𝑎𝐴𝑥 = (𝑎𝐵)) → ∃𝑏𝐵𝑏, 𝑦⟩ ∈ 𝑎))
1716albii 1888 . . . . . 6 (∀𝑎((𝑎𝐴𝑥 = (𝑎𝐵)) → 𝑦𝑥) ↔ ∀𝑎((𝑎𝐴𝑥 = (𝑎𝐵)) → ∃𝑏𝐵𝑏, 𝑦⟩ ∈ 𝑎))
186, 7, 173bitr2i 288 . . . . 5 ((∃𝑎𝐴 𝑥 = (𝑎𝐵) → 𝑦𝑥) ↔ ∀𝑎((𝑎𝐴𝑥 = (𝑎𝐵)) → ∃𝑏𝐵𝑏, 𝑦⟩ ∈ 𝑎))
1918albii 1888 . . . 4 (∀𝑥(∃𝑎𝐴 𝑥 = (𝑎𝐵) → 𝑦𝑥) ↔ ∀𝑥𝑎((𝑎𝐴𝑥 = (𝑎𝐵)) → ∃𝑏𝐵𝑏, 𝑦⟩ ∈ 𝑎))
20 19.23v 2012 . . . . . . 7 (∀𝑥((𝑎𝐴𝑥 = (𝑎𝐵)) → ∃𝑏𝐵𝑏, 𝑦⟩ ∈ 𝑎) ↔ (∃𝑥(𝑎𝐴𝑥 = (𝑎𝐵)) → ∃𝑏𝐵𝑏, 𝑦⟩ ∈ 𝑎))
21 vex 3335 . . . . . . . . . . 11 𝑎 ∈ V
22 imaexg 7260 . . . . . . . . . . 11 (𝑎 ∈ V → (𝑎𝐵) ∈ V)
2321, 22ax-mp 5 . . . . . . . . . 10 (𝑎𝐵) ∈ V
2423isseti 3341 . . . . . . . . 9 𝑥 𝑥 = (𝑎𝐵)
25 19.42v 2022 . . . . . . . . 9 (∃𝑥(𝑎𝐴𝑥 = (𝑎𝐵)) ↔ (𝑎𝐴 ∧ ∃𝑥 𝑥 = (𝑎𝐵)))
2624, 25mpbiran2 992 . . . . . . . 8 (∃𝑥(𝑎𝐴𝑥 = (𝑎𝐵)) ↔ 𝑎𝐴)
2726imbi1i 338 . . . . . . 7 ((∃𝑥(𝑎𝐴𝑥 = (𝑎𝐵)) → ∃𝑏𝐵𝑏, 𝑦⟩ ∈ 𝑎) ↔ (𝑎𝐴 → ∃𝑏𝐵𝑏, 𝑦⟩ ∈ 𝑎))
2820, 27bitri 264 . . . . . 6 (∀𝑥((𝑎𝐴𝑥 = (𝑎𝐵)) → ∃𝑏𝐵𝑏, 𝑦⟩ ∈ 𝑎) ↔ (𝑎𝐴 → ∃𝑏𝐵𝑏, 𝑦⟩ ∈ 𝑎))
2928albii 1888 . . . . 5 (∀𝑎𝑥((𝑎𝐴𝑥 = (𝑎𝐵)) → ∃𝑏𝐵𝑏, 𝑦⟩ ∈ 𝑎) ↔ ∀𝑎(𝑎𝐴 → ∃𝑏𝐵𝑏, 𝑦⟩ ∈ 𝑎))
30 alcom 2178 . . . . 5 (∀𝑥𝑎((𝑎𝐴𝑥 = (𝑎𝐵)) → ∃𝑏𝐵𝑏, 𝑦⟩ ∈ 𝑎) ↔ ∀𝑎𝑥((𝑎𝐴𝑥 = (𝑎𝐵)) → ∃𝑏𝐵𝑏, 𝑦⟩ ∈ 𝑎))
31 df-ral 3047 . . . . 5 (∀𝑎𝐴𝑏𝐵𝑏, 𝑦⟩ ∈ 𝑎 ↔ ∀𝑎(𝑎𝐴 → ∃𝑏𝐵𝑏, 𝑦⟩ ∈ 𝑎))
3229, 30, 313bitr4i 292 . . . 4 (∀𝑥𝑎((𝑎𝐴𝑥 = (𝑎𝐵)) → ∃𝑏𝐵𝑏, 𝑦⟩ ∈ 𝑎) ↔ ∀𝑎𝐴𝑏𝐵𝑏, 𝑦⟩ ∈ 𝑎)
3319, 32bitri 264 . . 3 (∀𝑥(∃𝑎𝐴 𝑥 = (𝑎𝐵) → 𝑦𝑥) ↔ ∀𝑎𝐴𝑏𝐵𝑏, 𝑦⟩ ∈ 𝑎)
344, 33bitri 264 . 2 (∀𝑧 ∈ {𝑥 ∣ ∃𝑎𝐴 𝑥 = (𝑎𝐵)}𝑦𝑧 ↔ ∀𝑎𝐴𝑏𝐵𝑏, 𝑦⟩ ∈ 𝑎)
352, 34bitri 264 1 (𝑦 {𝑥 ∣ ∃𝑎𝐴 𝑥 = (𝑎𝐵)} ↔ ∀𝑎𝐴𝑏𝐵𝑏, 𝑦⟩ ∈ 𝑎)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 196  wa 383  wal 1622   = wceq 1624  wex 1845  wcel 2131  {cab 2738  wral 3042  wrex 3043  Vcvv 3332  cop 4319   cint 4619   class class class wbr 4796  cima 5261
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1863  ax-4 1878  ax-5 1980  ax-6 2046  ax-7 2082  ax-8 2133  ax-9 2140  ax-10 2160  ax-11 2175  ax-12 2188  ax-13 2383  ax-ext 2732  ax-sep 4925  ax-nul 4933  ax-pr 5047  ax-un 7106
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3an 1074  df-tru 1627  df-ex 1846  df-nf 1851  df-sb 2039  df-eu 2603  df-mo 2604  df-clab 2739  df-cleq 2745  df-clel 2748  df-nfc 2883  df-ral 3047  df-rex 3048  df-rab 3051  df-v 3334  df-dif 3710  df-un 3712  df-in 3714  df-ss 3721  df-nul 4051  df-if 4223  df-sn 4314  df-pr 4316  df-op 4320  df-uni 4581  df-int 4620  df-br 4797  df-opab 4857  df-xp 5264  df-cnv 5266  df-dm 5268  df-rn 5269  df-res 5270  df-ima 5271
This theorem is referenced by:  intimass  38440  intimag  38442
  Copyright terms: Public domain W3C validator