Theorem djurclALT 16574

Description: Shortening of djurcl 7343 using djucllem 16572. (Contributed by BJ, 4-Jul-2022.) (Proof modification is discouraged.) (New usage is discouraged.)

Assertion

Ref	Expression
djurclALT	|- ( C e. B -> ( (inr |` B ) ` C ) e. ( A ⊔ B ) )

Proof of Theorem djurclALT

Dummy variable x is distinct from all other variables.

Step	Hyp	Ref	Expression
1		1oex 6655	. . . . 5 |- 1o e. _V
2		df-inr 7339	. . . . 5 |- inr = ( x e. _V |-> <. 1o , x >. )
3	1, 2	djucllem 16572	. . . 4 |- ( C e. B -> ( (inr |` B ) ` C ) e. ( { 1o } X. B ) )
4	3	olcd 742	. . 3 |- ( C e. B -> ( ( (inr |` B ) ` C ) e. ( { (/) } X. A ) \/ ( (inr |` B ) ` C ) e. ( { 1o } X. B ) ) )
5		elun 3360	. . 3 |- ( ( (inr |` B ) ` C ) e. ( ( { (/) } X. A ) u. ( { 1o } X. B ) ) <-> ( ( (inr |` B ) ` C ) e. ( { (/) } X. A ) \/ ( (inr |` B ) ` C ) e. ( { 1o } X. B ) ) )
6	4, 5	sylibr 134	. 2 |- ( C e. B -> ( (inr |` B ) ` C ) e. ( ( { (/) } X. A ) u. ( { 1o } X. B ) ) )
7		df-dju 7329	. 2 |- ( A ⊔ B ) = ( ( { (/) } X. A ) u. ( { 1o } X. B ) )
8	6, 7	eleqtrrdi 2326	1 |- ( C e. B -> ( (inr |` B ) ` C ) e. ( A ⊔ B ) )

Syntax hints:   -> wi 4   \/ wo 716   e. wcel 2203   u. cun 3209   (/)c0 3508   {csn 3689   X. cxp 4747   |` cres 4751   ` cfv 5352   1oc1o 6640   ⊔ cdju 7328  inrcinr 7337

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-in1 619  ax-in2 620  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-13 2205  ax-14 2206  ax-ext 2214  ax-sep 4228  ax-nul 4236  ax-pow 4287  ax-pr 4322  ax-un 4554

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-eu 2083  df-mo 2084  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ral 2525  df-rex 2526  df-v 2815  df-sbc 3043  df-dif 3213  df-un 3215  df-in 3217  df-ss 3224  df-nul 3509  df-pw 3671  df-sn 3695  df-pr 3696  df-op 3698  df-uni 3915  df-br 4110  df-opab 4172  df-mpt 4173  df-tr 4209  df-id 4414  df-iord 4487  df-on 4489  df-suc 4492  df-xp 4755  df-rel 4756  df-cnv 4757  df-co 4758  df-dm 4759  df-res 4761  df-iota 5312  df-fun 5354  df-fv 5360  df-1o 6647  df-dju 7329  df-inr 7339

This theorem is referenced by: (None)