Theorem funimass4 5729

Description: Membership relation for the values of a function whose image is a subclass. (Contributed by Raph Levien, 20-Nov-2006.)

Assertion

Ref	Expression
funimass4	⊢ ((Fun 𝐹 ∧ 𝐴 ⊆ dom 𝐹) → ((𝐹 “ 𝐴) ⊆ 𝐵 ↔ ∀𝑥 ∈ 𝐴 (𝐹‘𝑥) ∈ 𝐵))

Distinct variable groups:   𝑥,𝐴   𝑥,𝐵   𝑥,𝐹

Proof of Theorem funimass4

Dummy variable 𝑦 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		ssalel 3228	. 2 ⊢ ((𝐹 “ 𝐴) ⊆ 𝐵 ↔ ∀𝑦(𝑦 ∈ (𝐹 “ 𝐴) → 𝑦 ∈ 𝐵))
2		vex 2818	. . . . . . . . 9 ⊢ 𝑦 ∈ V
3	2	elima 5108	. . . . . . . 8 ⊢ (𝑦 ∈ (𝐹 “ 𝐴) ↔ ∃𝑥 ∈ 𝐴 𝑥𝐹𝑦)
4		eqcom 2236	. . . . . . . . . 10 ⊢ (𝑦 = (𝐹‘𝑥) ↔ (𝐹‘𝑥) = 𝑦)
5		ssel 3234	. . . . . . . . . . . 12 ⊢ (𝐴 ⊆ dom 𝐹 → (𝑥 ∈ 𝐴 → 𝑥 ∈ dom 𝐹))
6		funbrfvb 5719	. . . . . . . . . . . . 13 ⊢ ((Fun 𝐹 ∧ 𝑥 ∈ dom 𝐹) → ((𝐹‘𝑥) = 𝑦 ↔ 𝑥𝐹𝑦))
7	6	ex 115	. . . . . . . . . . . 12 ⊢ (Fun 𝐹 → (𝑥 ∈ dom 𝐹 → ((𝐹‘𝑥) = 𝑦 ↔ 𝑥𝐹𝑦)))
8	5, 7	syl9 72	. . . . . . . . . . 11 ⊢ (𝐴 ⊆ dom 𝐹 → (Fun 𝐹 → (𝑥 ∈ 𝐴 → ((𝐹‘𝑥) = 𝑦 ↔ 𝑥𝐹𝑦))))
9	8	imp31 256	. . . . . . . . . 10 ⊢ (((𝐴 ⊆ dom 𝐹 ∧ Fun 𝐹) ∧ 𝑥 ∈ 𝐴) → ((𝐹‘𝑥) = 𝑦 ↔ 𝑥𝐹𝑦))
10	4, 9	bitrid 192	. . . . . . . . 9 ⊢ (((𝐴 ⊆ dom 𝐹 ∧ Fun 𝐹) ∧ 𝑥 ∈ 𝐴) → (𝑦 = (𝐹‘𝑥) ↔ 𝑥𝐹𝑦))
11	10	rexbidva 2541	. . . . . . . 8 ⊢ ((𝐴 ⊆ dom 𝐹 ∧ Fun 𝐹) → (∃𝑥 ∈ 𝐴 𝑦 = (𝐹‘𝑥) ↔ ∃𝑥 ∈ 𝐴 𝑥𝐹𝑦))
12	3, 11	bitr4id 199	. . . . . . 7 ⊢ ((𝐴 ⊆ dom 𝐹 ∧ Fun 𝐹) → (𝑦 ∈ (𝐹 “ 𝐴) ↔ ∃𝑥 ∈ 𝐴 𝑦 = (𝐹‘𝑥)))
13	12	imbi1d 231	. . . . . 6 ⊢ ((𝐴 ⊆ dom 𝐹 ∧ Fun 𝐹) → ((𝑦 ∈ (𝐹 “ 𝐴) → 𝑦 ∈ 𝐵) ↔ (∃𝑥 ∈ 𝐴 𝑦 = (𝐹‘𝑥) → 𝑦 ∈ 𝐵)))
14		r19.23v 2654	. . . . . 6 ⊢ (∀𝑥 ∈ 𝐴 (𝑦 = (𝐹‘𝑥) → 𝑦 ∈ 𝐵) ↔ (∃𝑥 ∈ 𝐴 𝑦 = (𝐹‘𝑥) → 𝑦 ∈ 𝐵))
15	13, 14	bitr4di 198	. . . . 5 ⊢ ((𝐴 ⊆ dom 𝐹 ∧ Fun 𝐹) → ((𝑦 ∈ (𝐹 “ 𝐴) → 𝑦 ∈ 𝐵) ↔ ∀𝑥 ∈ 𝐴 (𝑦 = (𝐹‘𝑥) → 𝑦 ∈ 𝐵)))
16	15	albidv 1873	. . . 4 ⊢ ((𝐴 ⊆ dom 𝐹 ∧ Fun 𝐹) → (∀𝑦(𝑦 ∈ (𝐹 “ 𝐴) → 𝑦 ∈ 𝐵) ↔ ∀𝑦∀𝑥 ∈ 𝐴 (𝑦 = (𝐹‘𝑥) → 𝑦 ∈ 𝐵)))
17	16	ancoms 268	. . 3 ⊢ ((Fun 𝐹 ∧ 𝐴 ⊆ dom 𝐹) → (∀𝑦(𝑦 ∈ (𝐹 “ 𝐴) → 𝑦 ∈ 𝐵) ↔ ∀𝑦∀𝑥 ∈ 𝐴 (𝑦 = (𝐹‘𝑥) → 𝑦 ∈ 𝐵)))
18		ralcom4 2838	. . . 4 ⊢ (∀𝑥 ∈ 𝐴 ∀𝑦(𝑦 = (𝐹‘𝑥) → 𝑦 ∈ 𝐵) ↔ ∀𝑦∀𝑥 ∈ 𝐴 (𝑦 = (𝐹‘𝑥) → 𝑦 ∈ 𝐵))
19		ssel2 3235	. . . . . . . . 9 ⊢ ((𝐴 ⊆ dom 𝐹 ∧ 𝑥 ∈ 𝐴) → 𝑥 ∈ dom 𝐹)
20	19	anim2i 342	. . . . . . . 8 ⊢ ((Fun 𝐹 ∧ (𝐴 ⊆ dom 𝐹 ∧ 𝑥 ∈ 𝐴)) → (Fun 𝐹 ∧ 𝑥 ∈ dom 𝐹))
21	20	3impb 1226	. . . . . . 7 ⊢ ((Fun 𝐹 ∧ 𝐴 ⊆ dom 𝐹 ∧ 𝑥 ∈ 𝐴) → (Fun 𝐹 ∧ 𝑥 ∈ dom 𝐹))
22		funfvex 5689	. . . . . . 7 ⊢ ((Fun 𝐹 ∧ 𝑥 ∈ dom 𝐹) → (𝐹‘𝑥) ∈ V)
23		nfv 1577	. . . . . . . 8 ⊢ Ⅎ𝑦(𝐹‘𝑥) ∈ 𝐵
24		eleq1 2297	. . . . . . . 8 ⊢ (𝑦 = (𝐹‘𝑥) → (𝑦 ∈ 𝐵 ↔ (𝐹‘𝑥) ∈ 𝐵))
25	23, 24	ceqsalg 2844	. . . . . . 7 ⊢ ((𝐹‘𝑥) ∈ V → (∀𝑦(𝑦 = (𝐹‘𝑥) → 𝑦 ∈ 𝐵) ↔ (𝐹‘𝑥) ∈ 𝐵))
26	21, 22, 25	3syl 17	. . . . . 6 ⊢ ((Fun 𝐹 ∧ 𝐴 ⊆ dom 𝐹 ∧ 𝑥 ∈ 𝐴) → (∀𝑦(𝑦 = (𝐹‘𝑥) → 𝑦 ∈ 𝐵) ↔ (𝐹‘𝑥) ∈ 𝐵))
27	26	3expa 1230	. . . . 5 ⊢ (((Fun 𝐹 ∧ 𝐴 ⊆ dom 𝐹) ∧ 𝑥 ∈ 𝐴) → (∀𝑦(𝑦 = (𝐹‘𝑥) → 𝑦 ∈ 𝐵) ↔ (𝐹‘𝑥) ∈ 𝐵))
28	27	ralbidva 2540	. . . 4 ⊢ ((Fun 𝐹 ∧ 𝐴 ⊆ dom 𝐹) → (∀𝑥 ∈ 𝐴 ∀𝑦(𝑦 = (𝐹‘𝑥) → 𝑦 ∈ 𝐵) ↔ ∀𝑥 ∈ 𝐴 (𝐹‘𝑥) ∈ 𝐵))
29	18, 28	bitr3id 194	. . 3 ⊢ ((Fun 𝐹 ∧ 𝐴 ⊆ dom 𝐹) → (∀𝑦∀𝑥 ∈ 𝐴 (𝑦 = (𝐹‘𝑥) → 𝑦 ∈ 𝐵) ↔ ∀𝑥 ∈ 𝐴 (𝐹‘𝑥) ∈ 𝐵))
30	17, 29	bitrd 188	. 2 ⊢ ((Fun 𝐹 ∧ 𝐴 ⊆ dom 𝐹) → (∀𝑦(𝑦 ∈ (𝐹 “ 𝐴) → 𝑦 ∈ 𝐵) ↔ ∀𝑥 ∈ 𝐴 (𝐹‘𝑥) ∈ 𝐵))
31	1, 30	bitrid 192	1 ⊢ ((Fun 𝐹 ∧ 𝐴 ⊆ dom 𝐹) → ((𝐹 “ 𝐴) ⊆ 𝐵 ↔ ∀𝑥 ∈ 𝐴 (𝐹‘𝑥) ∈ 𝐵))

Syntax hints:   → wi 4   ∧ wa 104   ↔ wb 105   ∧ w3a 1005  ∀wal 1396   = wceq 1398   ∈ wcel 2205  ∀wral 2522  ∃wrex 2523  Vcvv 2815   ⊆ wss 3213   class class class wbr 4111  dom cdm 4751   “ cima 4754  Fun wfun 5348  ‘cfv 5354

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-14 2208  ax-ext 2216  ax-sep 4230  ax-pow 4289  ax-pr 4324

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ral 2527  df-rex 2528  df-v 2817  df-sbc 3045  df-un 3217  df-in 3219  df-ss 3226  df-pw 3673  df-sn 3697  df-pr 3698  df-op 3700  df-uni 3917  df-br 4112  df-opab 4174  df-id 4416  df-xp 4757  df-rel 4758  df-cnv 4759  df-co 4760  df-dm 4761  df-rn 4762  df-res 4763  df-ima 4764  df-iota 5314  df-fun 5356  df-fn 5357  df-fv 5362

This theorem is referenced by:  funimass3  5796  funimass5  5797  funconstss  5798  funimassov  6206  phimullem  12930  txcnp  15185  metcnp  15426  plycoeid3  15671