Theorem djurclALT 16398

Description: Shortening of djurcl 7250 using djucllem 16396. (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 6589	. . . . 5 |- 1o e. _V
2		df-inr 7246	. . . . 5 |- inr = ( x e. _V |-> <. 1o , x >. )
3	1, 2	djucllem 16396	. . . 4 |- ( C e. B -> ( (inr |` B ) ` C ) e. ( { 1o } X. B ) )
4	3	olcd 741	. . 3 |- ( C e. B -> ( ( (inr |` B ) ` C ) e. ( { (/) } X. A ) \/ ( (inr |` B ) ` C ) e. ( { 1o } X. B ) ) )
5		elun 3348	. . 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 7236	. 2 |- ( A ⊔ B ) = ( ( { (/) } X. A ) u. ( { 1o } X. B ) )
8	6, 7	eleqtrrdi 2325	1 |- ( C e. B -> ( (inr |` B ) ` C ) e. ( A ⊔ B ) )

Syntax hints:   -> wi 4   \/ wo 715   e. wcel 2202   u. cun 3198   (/)c0 3494   {csn 3669   X. cxp 4723   |` cres 4727   ` cfv 5326   1oc1o 6574   ⊔ cdju 7235  inrcinr 7244

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 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-sep 4207  ax-nul 4215  ax-pow 4264  ax-pr 4299  ax-un 4530

This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ral 2515  df-rex 2516  df-v 2804  df-sbc 3032  df-dif 3202  df-un 3204  df-in 3206  df-ss 3213  df-nul 3495  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-br 4089  df-opab 4151  df-mpt 4152  df-tr 4188  df-id 4390  df-iord 4463  df-on 4465  df-suc 4468  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-res 4737  df-iota 5286  df-fun 5328  df-fv 5334  df-1o 6581  df-dju 7236  df-inr 7246

This theorem is referenced by: (None)