Theorem djuinj 6991

Description: The "domain-disjoint-union" of two injective relations with disjoint ranges is an injective relation. (Contributed by BJ, 10-Jul-2022.)

Hypotheses

Ref	Expression
djuinj.r	⊢ (𝜑 → Fun ◡𝑅)
djuinj.s	⊢ (𝜑 → Fun ◡𝑆)
djuinj.disj	⊢ (𝜑 → (ran 𝑅 ∩ ran 𝑆) = ∅)

Assertion

Ref	Expression
djuinj	⊢ (𝜑 → Fun ◡(𝑅 ⊔d 𝑆))

Proof of Theorem djuinj

Step	Hyp	Ref	Expression
1		inlresf1 6946	. . . . . . 7 ⊢ (inl ↾ dom 𝑅):dom 𝑅–1-1→(dom 𝑅 ⊔ 𝐴)
2		f1fun 5331	. . . . . . 7 ⊢ ((inl ↾ dom 𝑅):dom 𝑅–1-1→(dom 𝑅 ⊔ 𝐴) → Fun (inl ↾ dom 𝑅))
3	1, 2	ax-mp 5	. . . . . 6 ⊢ Fun (inl ↾ dom 𝑅)
4		funcnvcnv 5182	. . . . . 6 ⊢ (Fun (inl ↾ dom 𝑅) → Fun ◡◡(inl ↾ dom 𝑅))
5	3, 4	ax-mp 5	. . . . 5 ⊢ Fun ◡◡(inl ↾ dom 𝑅)
6		djuinj.r	. . . . 5 ⊢ (𝜑 → Fun ◡𝑅)
7		funco 5163	. . . . 5 ⊢ ((Fun ◡◡(inl ↾ dom 𝑅) ∧ Fun ◡𝑅) → Fun (◡◡(inl ↾ dom 𝑅) ∘ ◡𝑅))
8	5, 6, 7	sylancr 410	. . . 4 ⊢ (𝜑 → Fun (◡◡(inl ↾ dom 𝑅) ∘ ◡𝑅))
9		cnvco 4724	. . . . 5 ⊢ ◡(𝑅 ∘ ◡(inl ↾ dom 𝑅)) = (◡◡(inl ↾ dom 𝑅) ∘ ◡𝑅)
10	9	funeqi 5144	. . . 4 ⊢ (Fun ◡(𝑅 ∘ ◡(inl ↾ dom 𝑅)) ↔ Fun (◡◡(inl ↾ dom 𝑅) ∘ ◡𝑅))
11	8, 10	sylibr 133	. . 3 ⊢ (𝜑 → Fun ◡(𝑅 ∘ ◡(inl ↾ dom 𝑅)))
12		inrresf1 6947	. . . . . . 7 ⊢ (inr ↾ dom 𝑆):dom 𝑆–1-1→(𝐴 ⊔ dom 𝑆)
13		f1fun 5331	. . . . . . 7 ⊢ ((inr ↾ dom 𝑆):dom 𝑆–1-1→(𝐴 ⊔ dom 𝑆) → Fun (inr ↾ dom 𝑆))
14	12, 13	ax-mp 5	. . . . . 6 ⊢ Fun (inr ↾ dom 𝑆)
15		funcnvcnv 5182	. . . . . 6 ⊢ (Fun (inr ↾ dom 𝑆) → Fun ◡◡(inr ↾ dom 𝑆))
16	14, 15	ax-mp 5	. . . . 5 ⊢ Fun ◡◡(inr ↾ dom 𝑆)
17		djuinj.s	. . . . 5 ⊢ (𝜑 → Fun ◡𝑆)
18		funco 5163	. . . . 5 ⊢ ((Fun ◡◡(inr ↾ dom 𝑆) ∧ Fun ◡𝑆) → Fun (◡◡(inr ↾ dom 𝑆) ∘ ◡𝑆))
19	16, 17, 18	sylancr 410	. . . 4 ⊢ (𝜑 → Fun (◡◡(inr ↾ dom 𝑆) ∘ ◡𝑆))
20		cnvco 4724	. . . . 5 ⊢ ◡(𝑆 ∘ ◡(inr ↾ dom 𝑆)) = (◡◡(inr ↾ dom 𝑆) ∘ ◡𝑆)
21	20	funeqi 5144	. . . 4 ⊢ (Fun ◡(𝑆 ∘ ◡(inr ↾ dom 𝑆)) ↔ Fun (◡◡(inr ↾ dom 𝑆) ∘ ◡𝑆))
22	19, 21	sylibr 133	. . 3 ⊢ (𝜑 → Fun ◡(𝑆 ∘ ◡(inr ↾ dom 𝑆)))
23		df-rn 4550	. . . . . . 7 ⊢ ran (𝑅 ∘ ◡(inl ↾ dom 𝑅)) = dom ◡(𝑅 ∘ ◡(inl ↾ dom 𝑅))
24		rncoss 4809	. . . . . . 7 ⊢ ran (𝑅 ∘ ◡(inl ↾ dom 𝑅)) ⊆ ran 𝑅
25	23, 24	eqsstrri 3130	. . . . . 6 ⊢ dom ◡(𝑅 ∘ ◡(inl ↾ dom 𝑅)) ⊆ ran 𝑅
26		df-rn 4550	. . . . . . 7 ⊢ ran (𝑆 ∘ ◡(inr ↾ dom 𝑆)) = dom ◡(𝑆 ∘ ◡(inr ↾ dom 𝑆))
27		rncoss 4809	. . . . . . 7 ⊢ ran (𝑆 ∘ ◡(inr ↾ dom 𝑆)) ⊆ ran 𝑆
28	26, 27	eqsstrri 3130	. . . . . 6 ⊢ dom ◡(𝑆 ∘ ◡(inr ↾ dom 𝑆)) ⊆ ran 𝑆
29		ss2in 3304	. . . . . 6 ⊢ ((dom ◡(𝑅 ∘ ◡(inl ↾ dom 𝑅)) ⊆ ran 𝑅 ∧ dom ◡(𝑆 ∘ ◡(inr ↾ dom 𝑆)) ⊆ ran 𝑆) → (dom ◡(𝑅 ∘ ◡(inl ↾ dom 𝑅)) ∩ dom ◡(𝑆 ∘ ◡(inr ↾ dom 𝑆))) ⊆ (ran 𝑅 ∩ ran 𝑆))
30	25, 28, 29	mp2an 422	. . . . 5 ⊢ (dom ◡(𝑅 ∘ ◡(inl ↾ dom 𝑅)) ∩ dom ◡(𝑆 ∘ ◡(inr ↾ dom 𝑆))) ⊆ (ran 𝑅 ∩ ran 𝑆)
31		djuinj.disj	. . . . 5 ⊢ (𝜑 → (ran 𝑅 ∩ ran 𝑆) = ∅)
32	30, 31	sseqtrid 3147	. . . 4 ⊢ (𝜑 → (dom ◡(𝑅 ∘ ◡(inl ↾ dom 𝑅)) ∩ dom ◡(𝑆 ∘ ◡(inr ↾ dom 𝑆))) ⊆ ∅)
33		ss0 3403	. . . 4 ⊢ ((dom ◡(𝑅 ∘ ◡(inl ↾ dom 𝑅)) ∩ dom ◡(𝑆 ∘ ◡(inr ↾ dom 𝑆))) ⊆ ∅ → (dom ◡(𝑅 ∘ ◡(inl ↾ dom 𝑅)) ∩ dom ◡(𝑆 ∘ ◡(inr ↾ dom 𝑆))) = ∅)
34	32, 33	syl 14	. . 3 ⊢ (𝜑 → (dom ◡(𝑅 ∘ ◡(inl ↾ dom 𝑅)) ∩ dom ◡(𝑆 ∘ ◡(inr ↾ dom 𝑆))) = ∅)
35		funun 5167	. . 3 ⊢ (((Fun ◡(𝑅 ∘ ◡(inl ↾ dom 𝑅)) ∧ Fun ◡(𝑆 ∘ ◡(inr ↾ dom 𝑆))) ∧ (dom ◡(𝑅 ∘ ◡(inl ↾ dom 𝑅)) ∩ dom ◡(𝑆 ∘ ◡(inr ↾ dom 𝑆))) = ∅) → Fun (◡(𝑅 ∘ ◡(inl ↾ dom 𝑅)) ∪ ◡(𝑆 ∘ ◡(inr ↾ dom 𝑆))))
36	11, 22, 34, 35	syl21anc 1215	. 2 ⊢ (𝜑 → Fun (◡(𝑅 ∘ ◡(inl ↾ dom 𝑅)) ∪ ◡(𝑆 ∘ ◡(inr ↾ dom 𝑆))))
37		df-djud 6988	. . . . 5 ⊢ (𝑅 ⊔d 𝑆) = ((𝑅 ∘ ◡(inl ↾ dom 𝑅)) ∪ (𝑆 ∘ ◡(inr ↾ dom 𝑆)))
38	37	cnveqi 4714	. . . 4 ⊢ ◡(𝑅 ⊔d 𝑆) = ◡((𝑅 ∘ ◡(inl ↾ dom 𝑅)) ∪ (𝑆 ∘ ◡(inr ↾ dom 𝑆)))
39		cnvun 4944	. . . 4 ⊢ ◡((𝑅 ∘ ◡(inl ↾ dom 𝑅)) ∪ (𝑆 ∘ ◡(inr ↾ dom 𝑆))) = (◡(𝑅 ∘ ◡(inl ↾ dom 𝑅)) ∪ ◡(𝑆 ∘ ◡(inr ↾ dom 𝑆)))
40	38, 39	eqtri 2160	. . 3 ⊢ ◡(𝑅 ⊔d 𝑆) = (◡(𝑅 ∘ ◡(inl ↾ dom 𝑅)) ∪ ◡(𝑆 ∘ ◡(inr ↾ dom 𝑆)))
41	40	funeqi 5144	. 2 ⊢ (Fun ◡(𝑅 ⊔d 𝑆) ↔ Fun (◡(𝑅 ∘ ◡(inl ↾ dom 𝑅)) ∪ ◡(𝑆 ∘ ◡(inr ↾ dom 𝑆))))
42	36, 41	sylibr 133	1 ⊢ (𝜑 → Fun ◡(𝑅 ⊔d 𝑆))

Syntax hints:   → wi 4   = wceq 1331   ∪ cun 3069   ∩ cin 3070   ⊆ wss 3071  ∅c0 3363  ^◡ccnv 4538  dom cdm 4539  ran crn 4540   ↾ cres 4541   ∘ ccom 4543  Fun wfun 5117  –1-1→wf1 5120   ⊔ cdju 6922  inlcinl 6930  inrcinr 6931   ⊔_d cdjud 6987

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 603  ax-in2 604  ax-io 698  ax-5 1423  ax-7 1424  ax-gen 1425  ax-ie1 1469  ax-ie2 1470  ax-8 1482  ax-10 1483  ax-11 1484  ax-i12 1485  ax-bndl 1486  ax-4 1487  ax-13 1491  ax-14 1492  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-i5r 1515  ax-ext 2121  ax-sep 4046  ax-nul 4054  ax-pow 4098  ax-pr 4131  ax-un 4355

This theorem depends on definitions:  df-bi 116  df-3an 964  df-tru 1334  df-nf 1437  df-sb 1736  df-eu 2002  df-mo 2003  df-clab 2126  df-cleq 2132  df-clel 2135  df-nfc 2270  df-ral 2421  df-rex 2422  df-v 2688  df-sbc 2910  df-dif 3073  df-un 3075  df-in 3077  df-ss 3084  df-nul 3364  df-pw 3512  df-sn 3533  df-pr 3534  df-op 3536  df-uni 3737  df-br 3930  df-opab 3990  df-mpt 3991  df-tr 4027  df-id 4215  df-iord 4288  df-on 4290  df-suc 4293  df-xp 4545  df-rel 4546  df-cnv 4547  df-co 4548  df-dm 4549  df-rn 4550  df-res 4551  df-iota 5088  df-fun 5125  df-fn 5126  df-f 5127  df-f1 5128  df-fo 5129  df-f1o 5130  df-fv 5131  df-1st 6038  df-2nd 6039  df-1o 6313  df-dju 6923  df-inl 6932  df-inr 6933  df-djud 6988

This theorem is referenced by: (None)