Theorem endjudisj 7066

Description: Equinumerosity of a disjoint union and a union of two disjoint sets. (Contributed by Jim Kingdon, 30-Jul-2023.)

Assertion

Ref	Expression
endjudisj	|- ( ( A e. V /\ B e. W /\ ( A i^i B ) = (/) ) -> ( A ⊔ B ) ~~ ( A u. B ) )

Proof of Theorem endjudisj

Step	Hyp	Ref	Expression
1		djuun 6952	. 2 |- ( (inl " A ) u. (inr " B ) ) = ( A ⊔ B )
2		eninl 6982	. . . 4 |- ( A e. V -> (inl " A ) ~~ A )
3	2	3ad2ant1 1002	. . 3 |- ( ( A e. V /\ B e. W /\ ( A i^i B ) = (/) ) -> (inl " A ) ~~ A )
4		eninr 6983	. . . 4 |- ( B e. W -> (inr " B ) ~~ B )
5	4	3ad2ant2 1003	. . 3 |- ( ( A e. V /\ B e. W /\ ( A i^i B ) = (/) ) -> (inr " B ) ~~ B )
6		djuin 6949	. . . 4 |- ( (inl " A ) i^i (inr " B ) ) = (/)
7	6	a1i 9	. . 3 |- ( ( A e. V /\ B e. W /\ ( A i^i B ) = (/) ) -> ( (inl " A ) i^i (inr " B ) ) = (/) )
8		simp3 983	. . 3 |- ( ( A e. V /\ B e. W /\ ( A i^i B ) = (/) ) -> ( A i^i B ) = (/) )
9		unen 6710	. . 3 |- ( ( ( (inl " A ) ~~ A /\ (inr " B ) ~~ B ) /\ ( ( (inl " A ) i^i (inr " B ) ) = (/) /\ ( A i^i B ) = (/) ) ) -> ( (inl " A ) u. (inr " B ) ) ~~ ( A u. B ) )
10	3, 5, 7, 8, 9	syl22anc 1217	. 2 |- ( ( A e. V /\ B e. W /\ ( A i^i B ) = (/) ) -> ( (inl " A ) u. (inr " B ) ) ~~ ( A u. B ) )
11	1, 10	eqbrtrrid 3964	1 |- ( ( A e. V /\ B e. W /\ ( A i^i B ) = (/) ) -> ( A ⊔ B ) ~~ ( A u. B ) )

Syntax hints:   -> wi 4   /\ w3a 962   = wceq 1331   e. wcel 1480   u. cun 3069   i^i cin 3070   (/)c0 3363   class class class wbr 3929   "cima 4542   ~~ cen 6632   ⊔ cdju 6922  inlcinl 6930  inrcinr 6931

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-coll 4043  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-fal 1337  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-ne 2309  df-ral 2421  df-rex 2422  df-reu 2423  df-rab 2425  df-v 2688  df-sbc 2910  df-csb 3004  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-iun 3815  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-ima 4552  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-er 6429  df-en 6635  df-dju 6923  df-inl 6932  df-inr 6933

This theorem is referenced by:  djuenun  7068  dju0en  7070  exmidunben  11939