Theorem ncfindi 4475

Description: Distribution law for finite cardinality. (Contributed by SF, 30-Jan-2015.)

Assertion

Ref	Expression
ncfindi	|- (((_V e. Fin /\ A e. V) /\ B e. W /\ (A i^i B) = (/)) -> Ncfin (A u. B) = ( Ncfin A +o Ncfin B))

Proof of Theorem ncfindi

Step	Hyp	Ref	Expression
1		simp1l 979	. . . 4 |- (((_V e. Fin /\ A e. V) /\ B e. W /\ (A i^i B) = (/)) -> _V e. Fin )
2		simp1r 980	. . . . 5 |- (((_V e. Fin /\ A e. V) /\ B e. W /\ (A i^i B) = (/)) -> A e. V)
3		simp2 956	. . . . 5 |- (((_V e. Fin /\ A e. V) /\ B e. W /\ (A i^i B) = (/)) -> B e. W)
4		unexg 4101	. . . . 5 |- ((A e. V /\ B e. W) -> (A u. B) e. _V)
5	2, 3, 4	syl2anc 642	. . . 4 |- (((_V e. Fin /\ A e. V) /\ B e. W /\ (A i^i B) = (/)) -> (A u. B) e. _V)
6		ncfinprop 4474	. . . 4 |- ((_V e. Fin /\ (A u. B) e. _V) -> ( Ncfin (A u. B) e. Nn /\ (A u. B) e. Ncfin (A u. B)))
7	1, 5, 6	syl2anc 642	. . 3 |- (((_V e. Fin /\ A e. V) /\ B e. W /\ (A i^i B) = (/)) -> ( Ncfin (A u. B) e. Nn /\ (A u. B) e. Ncfin (A u. B)))
8	7	simpld 445	. 2 |- (((_V e. Fin /\ A e. V) /\ B e. W /\ (A i^i B) = (/)) -> Ncfin (A u. B) e. Nn )
9		ncfinprop 4474	. . . . 5 |- ((_V e. Fin /\ A e. V) -> ( Ncfin A e. Nn /\ A e. Ncfin A))
10	1, 2, 9	syl2anc 642	. . . 4 |- (((_V e. Fin /\ A e. V) /\ B e. W /\ (A i^i B) = (/)) -> ( Ncfin A e. Nn /\ A e. Ncfin A))
11	10	simpld 445	. . 3 |- (((_V e. Fin /\ A e. V) /\ B e. W /\ (A i^i B) = (/)) -> Ncfin A e. Nn )
12		ncfinprop 4474	. . . . 5 |- ((_V e. Fin /\ B e. W) -> ( Ncfin B e. Nn /\ B e. Ncfin B))
13	1, 3, 12	syl2anc 642	. . . 4 |- (((_V e. Fin /\ A e. V) /\ B e. W /\ (A i^i B) = (/)) -> ( Ncfin B e. Nn /\ B e. Ncfin B))
14	13	simpld 445	. . 3 |- (((_V e. Fin /\ A e. V) /\ B e. W /\ (A i^i B) = (/)) -> Ncfin B e. Nn )
15		nncaddccl 4419	. . 3 |- (( Ncfin A e. Nn /\ Ncfin B e. Nn ) -> ( Ncfin A +o Ncfin B) e. Nn )
16	11, 14, 15	syl2anc 642	. 2 |- (((_V e. Fin /\ A e. V) /\ B e. W /\ (A i^i B) = (/)) -> ( Ncfin A +o Ncfin B) e. Nn )
17	7	simprd 449	. 2 |- (((_V e. Fin /\ A e. V) /\ B e. W /\ (A i^i B) = (/)) -> (A u. B) e. Ncfin (A u. B))
18	10	simprd 449	. . 3 |- (((_V e. Fin /\ A e. V) /\ B e. W /\ (A i^i B) = (/)) -> A e. Ncfin A)
19	13	simprd 449	. . 3 |- (((_V e. Fin /\ A e. V) /\ B e. W /\ (A i^i B) = (/)) -> B e. Ncfin B)
20		simp3 957	. . 3 |- (((_V e. Fin /\ A e. V) /\ B e. W /\ (A i^i B) = (/)) -> (A i^i B) = (/))
21		eladdci 4399	. . 3 |- ((A e. Ncfin A /\ B e. Ncfin B /\ (A i^i B) = (/)) -> (A u. B) e. ( Ncfin A +o Ncfin B))
22	18, 19, 20, 21	syl3anc 1182	. 2 |- (((_V e. Fin /\ A e. V) /\ B e. W /\ (A i^i B) = (/)) -> (A u. B) e. ( Ncfin A +o Ncfin B))
23		nnceleq 4430	. 2 |- ((( Ncfin (A u. B) e. Nn /\ ( Ncfin A +o Ncfin B) e. Nn ) /\ ((A u. B) e. Ncfin (A u. B) /\ (A u. B) e. ( Ncfin A +o Ncfin B))) -> Ncfin (A u. B) = ( Ncfin A +o Ncfin B))
24	8, 16, 17, 22, 23	syl22anc 1183	1 |- (((_V e. Fin /\ A e. V) /\ B e. W /\ (A i^i B) = (/)) -> Ncfin (A u. B) = ( Ncfin A +o Ncfin B))

Syntax hints:   -> wi 4   /\ wa 358   /\ w3a 934   = wceq 1642   e. wcel 1710  _Vcvv 2859   u. cun 3207   i^i cin 3208  (/)c0 3550   Nn cnnc 4373   +o cplc 4375   Fin cfin 4376   Nc_fin cncfin 4434

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-14 1714  ax-6 1729  ax-7 1734  ax-11 1746  ax-12 1925  ax-ext 2334  ax-nin 4078  ax-xp 4079  ax-cnv 4080  ax-1c 4081  ax-sset 4082  ax-si 4083  ax-ins2 4084  ax-ins3 4085  ax-typlower 4086  ax-sn 4087

This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3an 936  df-nan 1288  df-tru 1319  df-ex 1542  df-nf 1545  df-sb 1649  df-eu 2208  df-mo 2209  df-clab 2340  df-cleq 2346  df-clel 2349  df-nfc 2478  df-ne 2518  df-ral 2619  df-rex 2620  df-reu 2621  df-rmo 2622  df-rab 2623  df-v 2861  df-sbc 3047  df-nin 3211  df-compl 3212  df-in 3213  df-un 3214  df-dif 3215  df-symdif 3216  df-ss 3259  df-pss 3261  df-nul 3551  df-if 3663  df-pw 3724  df-sn 3741  df-pr 3742  df-uni 3892  df-int 3927  df-opk 4058  df-1c 4136  df-pw1 4137  df-uni1 4138  df-xpk 4185  df-cnvk 4186  df-ins2k 4187  df-ins3k 4188  df-imak 4189  df-cok 4190  df-p6 4191  df-sik 4192  df-ssetk 4193  df-imagek 4194  df-idk 4195  df-iota 4339  df-0c 4377  df-addc 4378  df-nnc 4379  df-fin 4380  df-ncfin 4442

This theorem is referenced by:  vfintle  4546  vfin1cltv  4547  vfinncsp  4554