Theorem iineq12i 36908

Description: Equality theorem for indexed intersection. Inference version. General version of iineq1i 36907. (Contributed by GG, 1-Sep-2025.)

Hypotheses

Ref	Expression
iineq12i.1	⊢ 𝐴 = 𝐵
iineq12i.2	⊢ 𝐶 = 𝐷

Assertion

Ref	Expression
iineq12i	⊢ ∩ 𝑥 ∈ 𝐴 𝐶 = ∩ 𝑥 ∈ 𝐵 𝐷

Proof of Theorem iineq12i

Dummy variable 𝑡 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		iineq12i.1	. . . 4 ⊢ 𝐴 = 𝐵
2		iineq12i.2	. . . . 5 ⊢ 𝐶 = 𝐷
3	2	eleq2i 2852	. . . 4 ⊢ (𝑡 ∈ 𝐶 ↔ 𝑡 ∈ 𝐷)
4	1, 3	raleqbii 3332	. . 3 ⊢ (∀𝑥 ∈ 𝐴 𝑡 ∈ 𝐶 ↔ ∀𝑥 ∈ 𝐵 𝑡 ∈ 𝐷)
5	4	abbii 2827	. 2 ⊢ {𝑡 ∣ ∀𝑥 ∈ 𝐴 𝑡 ∈ 𝐶} = {𝑡 ∣ ∀𝑥 ∈ 𝐵 𝑡 ∈ 𝐷}
6		df-iin 4953	. 2 ⊢ ∩ 𝑥 ∈ 𝐴 𝐶 = {𝑡 ∣ ∀𝑥 ∈ 𝐴 𝑡 ∈ 𝐶}
7		df-iin 4953	. 2 ⊢ ∩ 𝑥 ∈ 𝐵 𝐷 = {𝑡 ∣ ∀𝑥 ∈ 𝐵 𝑡 ∈ 𝐷}
8	5, 6, 7	3eqtr4i 2793	1 ⊢ ∩ 𝑥 ∈ 𝐴 𝐶 = ∩ 𝑥 ∈ 𝐵 𝐷

This proof depends on syntax axioms:   = wceq 1570   ∈ wcel 2145  {cab 2738  ∀wral 3076  ∩ ciin 4951

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-ext 2732

This proof depends on definitions:  df-bi 210  df-an 402  df-ex 1813  df-sb 2100  df-clab 2739  df-cleq 2752  df-clel 2835  df-ral 3077  df-iin 4953

This theorem is used by: (None)