Theorem abfmpeld 30417

Description: Membership in an element of a mapping function-defined family of sets. (Contributed by Thierry Arnoux, 19-Oct-2016.)

Hypotheses

Ref	Expression
abfmpeld.1	⊢ 𝐹 = (𝑥 ∈ 𝑉 ↦ {𝑦 ∣ 𝜓})
abfmpeld.2	⊢ (𝜑 → {𝑦 ∣ 𝜓} ∈ V)
abfmpeld.3	⊢ (𝜑 → ((𝑥 = 𝐴 ∧ 𝑦 = 𝐵) → (𝜓 ↔ 𝜒)))

Assertion

Ref	Expression
abfmpeld	⊢ (𝜑 → ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐵 ∈ (𝐹‘𝐴) ↔ 𝜒)))

Distinct variable groups:   𝑥,𝑦,𝐴   𝑥,𝐵,𝑦   𝑥,𝐹,𝑦   𝑥,𝑉,𝑦   𝑦,𝑊   𝜒,𝑥,𝑦   𝜑,𝑥,𝑦

Allowed substitution hints:   𝜓(𝑥,𝑦)   𝑊(𝑥)

Proof of Theorem abfmpeld

Step	Hyp	Ref	Expression
1		abfmpeld.2	. . . . . . . . . 10 ⊢ (𝜑 → {𝑦 ∣ 𝜓} ∈ V)
2	1	alrimiv 1928	. . . . . . . . 9 ⊢ (𝜑 → ∀𝑥{𝑦 ∣ 𝜓} ∈ V)
3		csbexg 5178	. . . . . . . . 9 ⊢ (∀𝑥{𝑦 ∣ 𝜓} ∈ V → ⦋𝐴 / 𝑥⦌{𝑦 ∣ 𝜓} ∈ V)
4	2, 3	syl 17	. . . . . . . 8 ⊢ (𝜑 → ⦋𝐴 / 𝑥⦌{𝑦 ∣ 𝜓} ∈ V)
5		abfmpeld.1	. . . . . . . . 9 ⊢ 𝐹 = (𝑥 ∈ 𝑉 ↦ {𝑦 ∣ 𝜓})
6	5	fvmpts 6748	. . . . . . . 8 ⊢ ((𝐴 ∈ 𝑉 ∧ ⦋𝐴 / 𝑥⦌{𝑦 ∣ 𝜓} ∈ V) → (𝐹‘𝐴) = ⦋𝐴 / 𝑥⦌{𝑦 ∣ 𝜓})
7	4, 6	sylan2 595	. . . . . . 7 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝜑) → (𝐹‘𝐴) = ⦋𝐴 / 𝑥⦌{𝑦 ∣ 𝜓})
8		csbab 4345	. . . . . . 7 ⊢ ⦋𝐴 / 𝑥⦌{𝑦 ∣ 𝜓} = {𝑦 ∣ [𝐴 / 𝑥]𝜓}
9	7, 8	eqtrdi 2849	. . . . . 6 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝜑) → (𝐹‘𝐴) = {𝑦 ∣ [𝐴 / 𝑥]𝜓})
10	9	eleq2d 2875	. . . . 5 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝜑) → (𝐵 ∈ (𝐹‘𝐴) ↔ 𝐵 ∈ {𝑦 ∣ [𝐴 / 𝑥]𝜓}))
11	10	adantl 485	. . . 4 ⊢ ((𝐵 ∈ 𝑊 ∧ (𝐴 ∈ 𝑉 ∧ 𝜑)) → (𝐵 ∈ (𝐹‘𝐴) ↔ 𝐵 ∈ {𝑦 ∣ [𝐴 / 𝑥]𝜓}))
12		simpll 766	. . . . . . . 8 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝜑) ∧ 𝑦 = 𝐵) → 𝐴 ∈ 𝑉)
13		abfmpeld.3	. . . . . . . . . . 11 ⊢ (𝜑 → ((𝑥 = 𝐴 ∧ 𝑦 = 𝐵) → (𝜓 ↔ 𝜒)))
14	13	ancomsd 469	. . . . . . . . . 10 ⊢ (𝜑 → ((𝑦 = 𝐵 ∧ 𝑥 = 𝐴) → (𝜓 ↔ 𝜒)))
15	14	adantl 485	. . . . . . . . 9 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝜑) → ((𝑦 = 𝐵 ∧ 𝑥 = 𝐴) → (𝜓 ↔ 𝜒)))
16	15	impl 459	. . . . . . . 8 ⊢ ((((𝐴 ∈ 𝑉 ∧ 𝜑) ∧ 𝑦 = 𝐵) ∧ 𝑥 = 𝐴) → (𝜓 ↔ 𝜒))
17	12, 16	sbcied 3762	. . . . . . 7 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝜑) ∧ 𝑦 = 𝐵) → ([𝐴 / 𝑥]𝜓 ↔ 𝜒))
18	17	ex 416	. . . . . 6 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝜑) → (𝑦 = 𝐵 → ([𝐴 / 𝑥]𝜓 ↔ 𝜒)))
19	18	alrimiv 1928	. . . . 5 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝜑) → ∀𝑦(𝑦 = 𝐵 → ([𝐴 / 𝑥]𝜓 ↔ 𝜒)))
20		elabgt 3609	. . . . 5 ⊢ ((𝐵 ∈ 𝑊 ∧ ∀𝑦(𝑦 = 𝐵 → ([𝐴 / 𝑥]𝜓 ↔ 𝜒))) → (𝐵 ∈ {𝑦 ∣ [𝐴 / 𝑥]𝜓} ↔ 𝜒))
21	19, 20	sylan2 595	. . . 4 ⊢ ((𝐵 ∈ 𝑊 ∧ (𝐴 ∈ 𝑉 ∧ 𝜑)) → (𝐵 ∈ {𝑦 ∣ [𝐴 / 𝑥]𝜓} ↔ 𝜒))
22	11, 21	bitrd 282	. . 3 ⊢ ((𝐵 ∈ 𝑊 ∧ (𝐴 ∈ 𝑉 ∧ 𝜑)) → (𝐵 ∈ (𝐹‘𝐴) ↔ 𝜒))
23	22	an13s 650	. 2 ⊢ ((𝜑 ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊)) → (𝐵 ∈ (𝐹‘𝐴) ↔ 𝜒))
24	23	ex 416	1 ⊢ (𝜑 → ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐵 ∈ (𝐹‘𝐴) ↔ 𝜒)))

Syntax hints:   → wi 4   ↔ wb 209   ∧ wa 399  ∀wal 1536   = wceq 1538   ∈ wcel 2111  {cab 2776  Vcvv 3441  [wsbc 3720  ⦋csb 3828   ↦ cmpt 5110  ‘cfv 6324

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2113  ax-9 2121  ax-10 2142  ax-11 2158  ax-12 2175  ax-ext 2770  ax-sep 5167  ax-nul 5174  ax-pr 5295

This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3an 1086  df-tru 1541  df-fal 1551  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2598  df-eu 2629  df-clab 2777  df-cleq 2791  df-clel 2870  df-nfc 2938  df-ral 3111  df-rex 3112  df-v 3443  df-sbc 3721  df-csb 3829  df-dif 3884  df-un 3886  df-in 3888  df-ss 3898  df-nul 4244  df-if 4426  df-sn 4526  df-pr 4528  df-op 4532  df-uni 4801  df-br 5031  df-opab 5093  df-mpt 5111  df-id 5425  df-xp 5525  df-rel 5526  df-cnv 5527  df-co 5528  df-dm 5529  df-iota 6283  df-fun 6326  df-fv 6332

This theorem is referenced by: (None)