Theorem elimaint 44395

Description: Element of image of intersection. (Contributed by RP, 13-Apr-2020.)

Assertion

Ref	Expression
elimaint	⊢ (𝑦 ∈ (∩ 𝐴 “ 𝐵) ↔ ∃𝑏 ∈ 𝐵 ∀𝑎 ∈ 𝐴 ⟨𝑏, 𝑦⟩ ∈ 𝑎)

Distinct variable groups:   𝑎,𝑏,𝐴   𝐵,𝑏   𝑦,𝑎,𝑏

Allowed substitution hints:   𝐴(𝑦)   𝐵(𝑦,𝑎)

Proof of Theorem elimaint

Step	Hyp	Ref	Expression
1		vex 3459	. . 3 ⊢ 𝑦 ∈ V
2	1	elima 6067	. 2 ⊢ (𝑦 ∈ (∩ 𝐴 “ 𝐵) ↔ ∃𝑏 ∈ 𝐵 𝑏∩ 𝐴𝑦)
3		df-br 5110	. . . 4 ⊢ (𝑏∩ 𝐴𝑦 ↔ ⟨𝑏, 𝑦⟩ ∈ ∩ 𝐴)
4		opex 5445	. . . . 5 ⊢ ⟨𝑏, 𝑦⟩ ∈ V
5	4	elint2 4919	. . . 4 ⊢ (⟨𝑏, 𝑦⟩ ∈ ∩ 𝐴 ↔ ∀𝑎 ∈ 𝐴 ⟨𝑏, 𝑦⟩ ∈ 𝑎)
6	3, 5	bitri 278	. . 3 ⊢ (𝑏∩ 𝐴𝑦 ↔ ∀𝑎 ∈ 𝐴 ⟨𝑏, 𝑦⟩ ∈ 𝑎)
7	6	rexbii 3112	. 2 ⊢ (∃𝑏 ∈ 𝐵 𝑏∩ 𝐴𝑦 ↔ ∃𝑏 ∈ 𝐵 ∀𝑎 ∈ 𝐴 ⟨𝑏, 𝑦⟩ ∈ 𝑎)
8	2, 7	bitri 278	1 ⊢ (𝑦 ∈ (∩ 𝐴 “ 𝐵) ↔ ∃𝑏 ∈ 𝐵 ∀𝑎 ∈ 𝐴 ⟨𝑏, 𝑦⟩ ∈ 𝑎)

Syntax hints:   ↔ wb 209   ∈ wcel 2143  ∀wral 3079  ∃wrex 3089  ⟨cop 4595  ∩ cint 4912   class class class wbr 5109   “ cima 5664

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1825  ax-4 1839  ax-5 1940  ax-6 1997  ax-7 2038  ax-8 2145  ax-9 2153  ax-ext 2735  ax-sep 5257  ax-pr 5404

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1810  df-sb 2097  df-clab 2742  df-cleq 2755  df-clel 2838  df-ral 3080  df-rex 3090  df-rab 3417  df-v 3457  df-dif 3908  df-un 3910  df-in 3912  df-ss 3922  df-nul 4287  df-if 4488  df-sn 4590  df-pr 4592  df-op 4596  df-int 4913  df-br 5110  df-opab 5174  df-xp 5667  df-cnv 5669  df-dm 5671  df-rn 5672  df-res 5673  df-ima 5674

This theorem is referenced by:  intimass  44400  intimag  44402