Theorem intabssd 43481

Description: When for each element 𝑦 there is a subset 𝐴 which may substituted for 𝑥 such that 𝑦 satisfying 𝜒 implies 𝑥 satisfies 𝜓 then the intersection of all 𝑥 that satisfy 𝜓 is a subclass the intersection of all 𝑦 that satisfy 𝜒. (Contributed by RP, 17-Oct-2020.)

Hypotheses

Ref	Expression
intabssd.ex	⊢ (𝜑 → 𝐴 ∈ 𝑉)
intabssd.sub	⊢ ((𝜑 ∧ 𝑥 = 𝐴) → (𝜒 → 𝜓))
intabssd.ss	⊢ (𝜑 → 𝐴 ⊆ 𝑦)

Assertion

Ref	Expression
intabssd	⊢ (𝜑 → ∩ {𝑥 ∣ 𝜓} ⊆ ∩ {𝑦 ∣ 𝜒})

Distinct variable groups:   𝜒,𝑥   𝜓,𝑦   𝑥,𝑦,𝜑   𝑥,𝐴

Allowed substitution hints:   𝜓(𝑥)   𝜒(𝑦)   𝐴(𝑦)   𝑉(𝑥,𝑦)

Proof of Theorem intabssd

Dummy variable 𝑧 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		intabssd.ex	. . . . 5 ⊢ (𝜑 → 𝐴 ∈ 𝑉)
2		intabssd.sub	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 = 𝐴) → (𝜒 → 𝜓))
3		eleq2 2833	. . . . . . . 8 ⊢ (𝑥 = 𝐴 → (𝑧 ∈ 𝑥 ↔ 𝑧 ∈ 𝐴))
4	3	biimpd 229	. . . . . . 7 ⊢ (𝑥 = 𝐴 → (𝑧 ∈ 𝑥 → 𝑧 ∈ 𝐴))
5		intabssd.ss	. . . . . . . 8 ⊢ (𝜑 → 𝐴 ⊆ 𝑦)
6	5	sseld 4007	. . . . . . 7 ⊢ (𝜑 → (𝑧 ∈ 𝐴 → 𝑧 ∈ 𝑦))
7	4, 6	sylan9r 508	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 = 𝐴) → (𝑧 ∈ 𝑥 → 𝑧 ∈ 𝑦))
8	2, 7	imim12d 81	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 = 𝐴) → ((𝜓 → 𝑧 ∈ 𝑥) → (𝜒 → 𝑧 ∈ 𝑦)))
9	1, 8	spcimdv 3606	. . . 4 ⊢ (𝜑 → (∀𝑥(𝜓 → 𝑧 ∈ 𝑥) → (𝜒 → 𝑧 ∈ 𝑦)))
10	9	alrimdv 1928	. . 3 ⊢ (𝜑 → (∀𝑥(𝜓 → 𝑧 ∈ 𝑥) → ∀𝑦(𝜒 → 𝑧 ∈ 𝑦)))
11		vex 3492	. . . 4 ⊢ 𝑧 ∈ V
12	11	elintab 4982	. . 3 ⊢ (𝑧 ∈ ∩ {𝑥 ∣ 𝜓} ↔ ∀𝑥(𝜓 → 𝑧 ∈ 𝑥))
13	11	elintab 4982	. . 3 ⊢ (𝑧 ∈ ∩ {𝑦 ∣ 𝜒} ↔ ∀𝑦(𝜒 → 𝑧 ∈ 𝑦))
14	10, 12, 13	3imtr4g 296	. 2 ⊢ (𝜑 → (𝑧 ∈ ∩ {𝑥 ∣ 𝜓} → 𝑧 ∈ ∩ {𝑦 ∣ 𝜒}))
15	14	ssrdv 4014	1 ⊢ (𝜑 → ∩ {𝑥 ∣ 𝜓} ⊆ ∩ {𝑦 ∣ 𝜒})

Syntax hints:   → wi 4   ∧ wa 395  ∀wal 1535   = wceq 1537   ∈ wcel 2108  {cab 2717   ⊆ wss 3976  ∩ cint 4970

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1793  ax-4 1807  ax-5 1909  ax-6 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-10 2141  ax-11 2158  ax-12 2178  ax-ext 2711

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 847  df-tru 1540  df-ex 1778  df-nf 1782  df-sb 2065  df-clab 2718  df-cleq 2732  df-clel 2819  df-ral 3068  df-v 3490  df-ss 3993  df-int 4971

This theorem is referenced by:  harval3  43500  clcnvlem  43585