Theorem fvelrnb 5365

Description: A member of a function's range is a value of the function. (Contributed by set.mm contributors, 31-Oct-1995.)

Assertion

Ref	Expression
fvelrnb	|- (F Fn A -> (B e. ran F <-> E.x e. A (F` x) = B))

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

Proof of Theorem fvelrnb

Dummy variable y is distinct from all other variables.

Step	Hyp	Ref	Expression
1		fnrnfv 5364	. . 3 |- (F Fn A -> ran F = {y | E.x e. A y = (F` x)})
2	1	eleq2d 2420	. 2 |- (F Fn A -> (B e. ran F <-> B e. {y | E.x e. A y = (F` x)}))
3		fvex 5339	. . . . 5 |- (F` x) e. _V
4		eleq1 2413	. . . . 5 |- ((F` x) = B -> ((F` x) e. _V <-> B e. _V))
5	3, 4	mpbii 202	. . . 4 |- ((F` x) = B -> B e. _V)
6	5	rexlimivw 2734	. . 3 |- (E.x e. A (F` x) = B -> B e. _V)
7		eqeq1 2359	. . . . 5 |- (y = B -> (y = (F` x) <-> B = (F` x)))
8		eqcom 2355	. . . . 5 |- (B = (F` x) <-> (F` x) = B)
9	7, 8	syl6bb 252	. . . 4 |- (y = B -> (y = (F` x) <-> (F` x) = B))
10	9	rexbidv 2635	. . 3 |- (y = B -> (E.x e. A y = (F` x) <-> E.x e. A (F` x) = B))
11	6, 10	elab3 2992	. 2 |- (B e. {y | E.x e. A y = (F` x)} <-> E.x e. A (F` x) = B)
12	2, 11	syl6bb 252	1 |- (F Fn A -> (B e. ran F <-> E.x e. A (F` x) = B))

Syntax hints:   -> wi 4   <-> wb 176   = wceq 1642   e. wcel 1710  {cab 2339  E.wrex 2615  _Vcvv 2859  ran crn 4773   Fn wfn 4776  ` cfv 4781

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-13 1712  ax-14 1714  ax-6 1729  ax-7 1734  ax-11 1746  ax-12 1925  ax-ext 2334  ax-nin 4078  ax-xp 4079  ax-cnv 4080  ax-1c 4081  ax-sset 4082  ax-si 4083  ax-ins2 4084  ax-ins3 4085  ax-typlower 4086  ax-sn 4087

This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3or 935  df-3an 936  df-nan 1288  df-tru 1319  df-ex 1542  df-nf 1545  df-sb 1649  df-eu 2208  df-mo 2209  df-clab 2340  df-cleq 2346  df-clel 2349  df-nfc 2478  df-ne 2518  df-ral 2619  df-rex 2620  df-reu 2621  df-rmo 2622  df-rab 2623  df-v 2861  df-sbc 3047  df-nin 3211  df-compl 3212  df-in 3213  df-un 3214  df-dif 3215  df-symdif 3216  df-ss 3259  df-pss 3261  df-nul 3551  df-if 3663  df-pw 3724  df-sn 3741  df-pr 3742  df-uni 3892  df-int 3927  df-opk 4058  df-1c 4136  df-pw1 4137  df-uni1 4138  df-xpk 4185  df-cnvk 4186  df-ins2k 4187  df-ins3k 4188  df-imak 4189  df-cok 4190  df-p6 4191  df-sik 4192  df-ssetk 4193  df-imagek 4194  df-idk 4195  df-iota 4339  df-0c 4377  df-addc 4378  df-nnc 4379  df-fin 4380  df-lefin 4440  df-ltfin 4441  df-ncfin 4442  df-tfin 4443  df-evenfin 4444  df-oddfin 4445  df-sfin 4446  df-spfin 4447  df-phi 4565  df-op 4566  df-proj1 4567  df-proj2 4568  df-opab 4623  df-br 4640  df-co 4726  df-ima 4727  df-id 4767  df-cnv 4785  df-rn 4786  df-dm 4787  df-fun 4789  df-fn 4790  df-fv 4795

This theorem is referenced by:  chfnrn  5399  ffnfv  5427  fconstfv  5456  isoini  5497