Theorem djulclALT 16333

Description: Shortening of djulcl 7241 using djucllem 16332. (Contributed by BJ, 4-Jul-2022.) (Proof modification is discouraged.) (New usage is discouraged.)

Assertion

Ref	Expression
djulclALT	⊢ (𝐶 ∈ 𝐴 → ((inl ↾ 𝐴)‘𝐶) ∈ (𝐴 ⊔ 𝐵))

Proof of Theorem djulclALT

Dummy variable 𝑥 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		0ex 4214	. . . . 5 ⊢ ∅ ∈ V
2		df-inl 7237	. . . . 5 ⊢ inl = (𝑥 ∈ V ↦ ⟨∅, 𝑥⟩)
3	1, 2	djucllem 16332	. . . 4 ⊢ (𝐶 ∈ 𝐴 → ((inl ↾ 𝐴)‘𝐶) ∈ ({∅} × 𝐴))
4	3	orcd 738	. . 3 ⊢ (𝐶 ∈ 𝐴 → (((inl ↾ 𝐴)‘𝐶) ∈ ({∅} × 𝐴) ∨ ((inl ↾ 𝐴)‘𝐶) ∈ ({1o} × 𝐵)))
5		elun 3346	. . 3 ⊢ (((inl ↾ 𝐴)‘𝐶) ∈ (({∅} × 𝐴) ∪ ({1o} × 𝐵)) ↔ (((inl ↾ 𝐴)‘𝐶) ∈ ({∅} × 𝐴) ∨ ((inl ↾ 𝐴)‘𝐶) ∈ ({1o} × 𝐵)))
6	4, 5	sylibr 134	. 2 ⊢ (𝐶 ∈ 𝐴 → ((inl ↾ 𝐴)‘𝐶) ∈ (({∅} × 𝐴) ∪ ({1o} × 𝐵)))
7		df-dju 7228	. 2 ⊢ (𝐴 ⊔ 𝐵) = (({∅} × 𝐴) ∪ ({1o} × 𝐵))
8	6, 7	eleqtrrdi 2323	1 ⊢ (𝐶 ∈ 𝐴 → ((inl ↾ 𝐴)‘𝐶) ∈ (𝐴 ⊔ 𝐵))

Syntax hints:   → wi 4   ∨ wo 713   ∈ wcel 2200   ∪ cun 3196  ∅c0 3492  {csn 3667   × cxp 4721   ↾ cres 4725  ‘cfv 5324  1_oc1o 6570   ⊔ cdju 7227  inlcinl 7235

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 617  ax-in2 618  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-14 2203  ax-ext 2211  ax-sep 4205  ax-nul 4213  ax-pow 4262  ax-pr 4297

This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ral 2513  df-rex 2514  df-v 2802  df-sbc 3030  df-dif 3200  df-un 3202  df-in 3204  df-ss 3211  df-nul 3493  df-pw 3652  df-sn 3673  df-pr 3674  df-op 3676  df-uni 3892  df-br 4087  df-opab 4149  df-mpt 4150  df-id 4388  df-xp 4729  df-rel 4730  df-cnv 4731  df-co 4732  df-dm 4733  df-res 4735  df-iota 5284  df-fun 5326  df-fv 5332  df-dju 7228  df-inl 7237

This theorem is referenced by: (None)