Theorem indifdi 4241

Description: Distribute intersection over difference. (Contributed by BTernaryTau, 14-Aug-2024.)

Assertion

Ref	Expression
indifdi	⊢ (𝐴 ∩ (𝐵 ∖ 𝐶)) = ((𝐴 ∩ 𝐵) ∖ (𝐴 ∩ 𝐶))

Proof of Theorem indifdi

Dummy variable 𝑥 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		elin 3913	. . 3 ⊢ (𝑥 ∈ (𝐴 ∩ (𝐵 ∖ 𝐶)) ↔ (𝑥 ∈ 𝐴 ∧ 𝑥 ∈ (𝐵 ∖ 𝐶)))
2		eldif 3907	. . . 4 ⊢ (𝑥 ∈ (𝐵 ∖ 𝐶) ↔ (𝑥 ∈ 𝐵 ∧ ¬ 𝑥 ∈ 𝐶))
3	2	anbi2i 623	. . 3 ⊢ ((𝑥 ∈ 𝐴 ∧ 𝑥 ∈ (𝐵 ∖ 𝐶)) ↔ (𝑥 ∈ 𝐴 ∧ (𝑥 ∈ 𝐵 ∧ ¬ 𝑥 ∈ 𝐶)))
4		abai 826	. . . . 5 ⊢ ((𝑥 ∈ 𝐴 ∧ ¬ 𝑥 ∈ 𝐶) ↔ (𝑥 ∈ 𝐴 ∧ (𝑥 ∈ 𝐴 → ¬ 𝑥 ∈ 𝐶)))
5	4	anbi2i 623	. . . 4 ⊢ ((𝑥 ∈ 𝐵 ∧ (𝑥 ∈ 𝐴 ∧ ¬ 𝑥 ∈ 𝐶)) ↔ (𝑥 ∈ 𝐵 ∧ (𝑥 ∈ 𝐴 ∧ (𝑥 ∈ 𝐴 → ¬ 𝑥 ∈ 𝐶))))
6		an12 645	. . . 4 ⊢ ((𝑥 ∈ 𝐴 ∧ (𝑥 ∈ 𝐵 ∧ ¬ 𝑥 ∈ 𝐶)) ↔ (𝑥 ∈ 𝐵 ∧ (𝑥 ∈ 𝐴 ∧ ¬ 𝑥 ∈ 𝐶)))
7		eldif 3907	. . . . 5 ⊢ (𝑥 ∈ ((𝐴 ∩ 𝐵) ∖ (𝐴 ∩ 𝐶)) ↔ (𝑥 ∈ (𝐴 ∩ 𝐵) ∧ ¬ 𝑥 ∈ (𝐴 ∩ 𝐶)))
8		elin 3913	. . . . . . 7 ⊢ (𝑥 ∈ (𝐴 ∩ 𝐵) ↔ (𝑥 ∈ 𝐴 ∧ 𝑥 ∈ 𝐵))
9	8	bicomi 224	. . . . . 6 ⊢ ((𝑥 ∈ 𝐴 ∧ 𝑥 ∈ 𝐵) ↔ 𝑥 ∈ (𝐴 ∩ 𝐵))
10		imnan 399	. . . . . . 7 ⊢ ((𝑥 ∈ 𝐴 → ¬ 𝑥 ∈ 𝐶) ↔ ¬ (𝑥 ∈ 𝐴 ∧ 𝑥 ∈ 𝐶))
11		elin 3913	. . . . . . 7 ⊢ (𝑥 ∈ (𝐴 ∩ 𝐶) ↔ (𝑥 ∈ 𝐴 ∧ 𝑥 ∈ 𝐶))
12	10, 11	xchbinxr 335	. . . . . 6 ⊢ ((𝑥 ∈ 𝐴 → ¬ 𝑥 ∈ 𝐶) ↔ ¬ 𝑥 ∈ (𝐴 ∩ 𝐶))
13	9, 12	anbi12i 628	. . . . 5 ⊢ (((𝑥 ∈ 𝐴 ∧ 𝑥 ∈ 𝐵) ∧ (𝑥 ∈ 𝐴 → ¬ 𝑥 ∈ 𝐶)) ↔ (𝑥 ∈ (𝐴 ∩ 𝐵) ∧ ¬ 𝑥 ∈ (𝐴 ∩ 𝐶)))
14		an21 644	. . . . 5 ⊢ (((𝑥 ∈ 𝐴 ∧ 𝑥 ∈ 𝐵) ∧ (𝑥 ∈ 𝐴 → ¬ 𝑥 ∈ 𝐶)) ↔ (𝑥 ∈ 𝐵 ∧ (𝑥 ∈ 𝐴 ∧ (𝑥 ∈ 𝐴 → ¬ 𝑥 ∈ 𝐶))))
15	7, 13, 14	3bitr2i 299	. . . 4 ⊢ (𝑥 ∈ ((𝐴 ∩ 𝐵) ∖ (𝐴 ∩ 𝐶)) ↔ (𝑥 ∈ 𝐵 ∧ (𝑥 ∈ 𝐴 ∧ (𝑥 ∈ 𝐴 → ¬ 𝑥 ∈ 𝐶))))
16	5, 6, 15	3bitr4i 303	. . 3 ⊢ ((𝑥 ∈ 𝐴 ∧ (𝑥 ∈ 𝐵 ∧ ¬ 𝑥 ∈ 𝐶)) ↔ 𝑥 ∈ ((𝐴 ∩ 𝐵) ∖ (𝐴 ∩ 𝐶)))
17	1, 3, 16	3bitri 297	. 2 ⊢ (𝑥 ∈ (𝐴 ∩ (𝐵 ∖ 𝐶)) ↔ 𝑥 ∈ ((𝐴 ∩ 𝐵) ∖ (𝐴 ∩ 𝐶)))
18	17	eqriv 2728	1 ⊢ (𝐴 ∩ (𝐵 ∖ 𝐶)) = ((𝐴 ∩ 𝐵) ∖ (𝐴 ∩ 𝐶))

Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 395   = wceq 1541   ∈ wcel 2111   ∖ cdif 3894   ∩ cin 3896

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1968  ax-7 2009  ax-8 2113  ax-9 2121  ax-ext 2703

This theorem depends on definitions:  df-bi 207  df-an 396  df-tru 1544  df-ex 1781  df-sb 2068  df-clab 2710  df-cleq 2723  df-clel 2806  df-v 3438  df-dif 3900  df-in 3904

This theorem is referenced by:  indifdir  4242  resdifdi  6183  iscnrm3rlem4  49053