Theorem clos1baseima 5884

Description: A closure is equal to the base set together with the image of the closure under R. Theorem X.4.37 of [Rosser] p. 303. (Contributed by SF, 10-Mar-2015.)

Hypotheses

Ref	Expression
clos1basesuc.1	⊢ S ∈ V
clos1basesuc.2	⊢ R ∈ V
clos1basesuc.3	⊢ C = Clos1 (S, R)

Assertion

Ref	Expression
clos1baseima	⊢ C = (S ∪ (R “ C))

Proof of Theorem clos1baseima

Dummy variables x y are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		elima 4755	. . . 4 ⊢ (x ∈ (R “ C) ↔ ∃y ∈ C yRx)
2	1	orbi2i 505	. . 3 ⊢ ((x ∈ S ∨ x ∈ (R “ C)) ↔ (x ∈ S ∨ ∃y ∈ C yRx))
3		elun 3221	. . 3 ⊢ (x ∈ (S ∪ (R “ C)) ↔ (x ∈ S ∨ x ∈ (R “ C)))
4		clos1basesuc.1	. . . 4 ⊢ S ∈ V
5		clos1basesuc.2	. . . 4 ⊢ R ∈ V
6		clos1basesuc.3	. . . 4 ⊢ C = Clos1 (S, R)
7	4, 5, 6	clos1basesuc 5883	. . 3 ⊢ (x ∈ C ↔ (x ∈ S ∨ ∃y ∈ C yRx))
8	2, 3, 7	3bitr4ri 269	. 2 ⊢ (x ∈ C ↔ x ∈ (S ∪ (R “ C)))
9	8	eqriv 2350	1 ⊢ C = (S ∪ (R “ C))

Syntax hints:   ∨ wo 357   = wceq 1642   ∈ wcel 1710  ∃wrex 2616  Vcvv 2860   ∪ cun 3208   class class class wbr 4640   “ cima 4723   Clos1 cclos1 5873

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 4079  ax-xp 4080  ax-cnv 4081  ax-1c 4082  ax-sset 4083  ax-si 4084  ax-ins2 4085  ax-ins3 4086  ax-typlower 4087  ax-sn 4088

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 2479  df-ne 2519  df-ral 2620  df-rex 2621  df-reu 2622  df-rmo 2623  df-rab 2624  df-v 2862  df-sbc 3048  df-nin 3212  df-compl 3213  df-in 3214  df-un 3215  df-dif 3216  df-symdif 3217  df-ss 3260  df-pss 3262  df-nul 3552  df-if 3664  df-pw 3725  df-sn 3742  df-pr 3743  df-uni 3893  df-int 3928  df-opk 4059  df-1c 4137  df-pw1 4138  df-uni1 4139  df-xpk 4186  df-cnvk 4187  df-ins2k 4188  df-ins3k 4189  df-imak 4190  df-cok 4191  df-p6 4192  df-sik 4193  df-ssetk 4194  df-imagek 4195  df-idk 4196  df-iota 4340  df-0c 4378  df-addc 4379  df-nnc 4380  df-fin 4381  df-lefin 4441  df-ltfin 4442  df-ncfin 4443  df-tfin 4444  df-evenfin 4445  df-oddfin 4446  df-sfin 4447  df-spfin 4448  df-phi 4566  df-op 4567  df-proj1 4568  df-proj2 4569  df-opab 4624  df-br 4641  df-1st 4724  df-swap 4725  df-sset 4726  df-co 4727  df-ima 4728  df-si 4729  df-id 4768  df-xp 4785  df-cnv 4786  df-rn 4787  df-dm 4788  df-res 4789  df-2nd 4798  df-txp 5737  df-fix 5741  df-ins2 5751  df-ins3 5753  df-image 5755  df-clos1 5874

This theorem is referenced by:  sbthlem1  6204  spacssnc  6285