Theorem inlresf1 7251

Description: The left injection restricted to the left class of a disjoint union is an injective function from the left class into the disjoint union. (Contributed by AV, 28-Jun-2022.)

Assertion

Ref	Expression
inlresf1	|- (inl |` A ) : A -1-1-> ( A ⊔ B )

Proof of Theorem inlresf1

Dummy variable x is distinct from all other variables.

Step	Hyp	Ref	Expression
1		djulf1or 7246	. 2 |- (inl |` A ) : A -1-1-onto-> ( { (/) } X. A )
2		djulclr 7239	. 2 |- ( x e. A -> ( (inl |` A ) ` x ) e. ( A ⊔ B ) )
3	1, 2	inresflem 7250	1 |- (inl |` A ) : A -1-1-> ( A ⊔ B )

Syntax hints:   (/)c0 3492   |` cres 4725   -1-1->wf1 5321   ⊔ 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-13 2202  ax-14 2203  ax-ext 2211  ax-sep 4205  ax-nul 4213  ax-pow 4262  ax-pr 4297  ax-un 4528

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-rn 4734  df-res 4735  df-iota 5284  df-fun 5326  df-fn 5327  df-f 5328  df-f1 5329  df-fo 5330  df-f1o 5331  df-fv 5332  df-1st 6298  df-2nd 6299  df-dju 7228  df-inl 7237

This theorem is referenced by:  updjudhcoinlf  7270  updjud  7272  caserel  7277  djudom  7283  difinfsn  7290  djufun  7294  djuinj  7296  djudoml  7424