Theorem 6lcm4e12 12649

Description: The least common multiple of six and four is twelve. (Contributed by AV, 27-Aug-2020.)

Assertion

Ref	Expression
6lcm4e12	|- ( 6 lcm 4 ) = ; 1 2

Proof of Theorem 6lcm4e12

Step	Hyp	Ref	Expression
1		6cn 9215	. . . 4 |- 6 e. CC
2		4cn 9211	. . . 4 |- 4 e. CC
3	1, 2	mulcli 8174	. . 3 |- ( 6 x. 4 ) e. CC
4		6nn0 9413	. . . . 5 |- 6 e. NN0
5	4	nn0zi 9491	. . . 4 |- 6 e. ZZ
6		4z 9499	. . . 4 |- 4 e. ZZ
7		lcmcl 12634	. . . . 5 |- ( ( 6 e. ZZ /\ 4 e. ZZ ) -> ( 6 lcm 4 ) e. NN0 )
8	7	nn0cnd 9447	. . . 4 |- ( ( 6 e. ZZ /\ 4 e. ZZ ) -> ( 6 lcm 4 ) e. CC )
9	5, 6, 8	mp2an 426	. . 3 |- ( 6 lcm 4 ) e. CC
10		gcdcl 12527	. . . . . 6 |- ( ( 6 e. ZZ /\ 4 e. ZZ ) -> ( 6 gcd 4 ) e. NN0 )
11	10	nn0cnd 9447	. . . . 5 |- ( ( 6 e. ZZ /\ 4 e. ZZ ) -> ( 6 gcd 4 ) e. CC )
12	5, 6, 11	mp2an 426	. . . 4 |- ( 6 gcd 4 ) e. CC
13	5, 6	pm3.2i 272	. . . . . . 7 |- ( 6 e. ZZ /\ 4 e. ZZ )
14		4ne0 9231	. . . . . . . . 9 |- 4 =/= 0
15	14	neii 2402	. . . . . . . 8 |- -. 4 = 0
16	15	intnan 934	. . . . . . 7 |- -. ( 6 = 0 /\ 4 = 0 )
17		gcdn0cl 12523	. . . . . . 7 |- ( ( ( 6 e. ZZ /\ 4 e. ZZ ) /\ -. ( 6 = 0 /\ 4 = 0 ) ) -> ( 6 gcd 4 ) e. NN )
18	13, 16, 17	mp2an 426	. . . . . 6 |- ( 6 gcd 4 ) e. NN
19	18	nnne0i 9165	. . . . 5 |- ( 6 gcd 4 ) =/= 0
20	18	nnzi 9490	. . . . . 6 |- ( 6 gcd 4 ) e. ZZ
21		0z 9480	. . . . . 6 |- 0 e. ZZ
22		zapne 9544	. . . . . 6 |- ( ( ( 6 gcd 4 ) e. ZZ /\ 0 e. ZZ ) -> ( ( 6 gcd 4 ) # 0 <-> ( 6 gcd 4 ) =/= 0 ) )
23	20, 21, 22	mp2an 426	. . . . 5 |- ( ( 6 gcd 4 ) # 0 <-> ( 6 gcd 4 ) =/= 0 )
24	19, 23	mpbir 146	. . . 4 |- ( 6 gcd 4 ) # 0
25	12, 24	pm3.2i 272	. . 3 |- ( ( 6 gcd 4 ) e. CC /\ ( 6 gcd 4 ) # 0 )
26		6nn 9299	. . . . . . . 8 |- 6 e. NN
27		4nn 9297	. . . . . . . 8 |- 4 e. NN
28	26, 27	pm3.2i 272	. . . . . . 7 |- ( 6 e. NN /\ 4 e. NN )
29		lcmgcdnn 12644	. . . . . . 7 |- ( ( 6 e. NN /\ 4 e. NN ) -> ( ( 6 lcm 4 ) x. ( 6 gcd 4 ) ) = ( 6 x. 4 ) )
30	28, 29	mp1i 10	. . . . . 6 |- ( ( ( 6 x. 4 ) e. CC /\ ( 6 lcm 4 ) e. CC /\ ( ( 6 gcd 4 ) e. CC /\ ( 6 gcd 4 ) # 0 ) ) -> ( ( 6 lcm 4 ) x. ( 6 gcd 4 ) ) = ( 6 x. 4 ) )
31	30	eqcomd 2235	. . . . 5 |- ( ( ( 6 x. 4 ) e. CC /\ ( 6 lcm 4 ) e. CC /\ ( ( 6 gcd 4 ) e. CC /\ ( 6 gcd 4 ) # 0 ) ) -> ( 6 x. 4 ) = ( ( 6 lcm 4 ) x. ( 6 gcd 4 ) ) )
32		divmulap3 8847	. . . . 5 |- ( ( ( 6 x. 4 ) e. CC /\ ( 6 lcm 4 ) e. CC /\ ( ( 6 gcd 4 ) e. CC /\ ( 6 gcd 4 ) # 0 ) ) -> ( ( ( 6 x. 4 ) / ( 6 gcd 4 ) ) = ( 6 lcm 4 ) <-> ( 6 x. 4 ) = ( ( 6 lcm 4 ) x. ( 6 gcd 4 ) ) ) )
33	31, 32	mpbird 167	. . . 4 |- ( ( ( 6 x. 4 ) e. CC /\ ( 6 lcm 4 ) e. CC /\ ( ( 6 gcd 4 ) e. CC /\ ( 6 gcd 4 ) # 0 ) ) -> ( ( 6 x. 4 ) / ( 6 gcd 4 ) ) = ( 6 lcm 4 ) )
34	33	eqcomd 2235	. . 3 |- ( ( ( 6 x. 4 ) e. CC /\ ( 6 lcm 4 ) e. CC /\ ( ( 6 gcd 4 ) e. CC /\ ( 6 gcd 4 ) # 0 ) ) -> ( 6 lcm 4 ) = ( ( 6 x. 4 ) / ( 6 gcd 4 ) ) )
35	3, 9, 25, 34	mp3an 1371	. 2 |- ( 6 lcm 4 ) = ( ( 6 x. 4 ) / ( 6 gcd 4 ) )
36		6gcd4e2 12556	. . 3 |- ( 6 gcd 4 ) = 2
37	36	oveq2i 6024	. 2 |- ( ( 6 x. 4 ) / ( 6 gcd 4 ) ) = ( ( 6 x. 4 ) / 2 )
38		2cn 9204	. . . 4 |- 2 e. CC
39		2ap0 9226	. . . 4 |- 2 # 0
40	1, 2, 38, 39	divassapi 8938	. . 3 |- ( ( 6 x. 4 ) / 2 ) = ( 6 x. ( 4 / 2 ) )
41		4d2e2 9294	. . . 4 |- ( 4 / 2 ) = 2
42	41	oveq2i 6024	. . 3 |- ( 6 x. ( 4 / 2 ) ) = ( 6 x. 2 )
43		6t2e12 9704	. . 3 |- ( 6 x. 2 ) = ; 1 2
44	40, 42, 43	3eqtri 2254	. 2 |- ( ( 6 x. 4 ) / 2 ) = ; 1 2
45	35, 37, 44	3eqtri 2254	1 |- ( 6 lcm 4 ) = ; 1 2

Syntax hints:   -. wn 3   /\ wa 104   <-> wb 105   /\ w3a 1002   = wceq 1395   e. wcel 2200   =/= wne 2400   class class class wbr 4086  (class class class)co 6013   CCcc 8020   0cc0 8022   1c1 8023   x. cmul 8027   # cap 8751   / cdiv 8842   NNcn 9133   2c2 9184   4c4 9186   6c6 9188   ZZcz 9469  ;cdc 9601   gcd cgcd 12514   lcm clcm 12622

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-coll 4202  ax-sep 4205  ax-nul 4213  ax-pow 4262  ax-pr 4297  ax-un 4528  ax-setind 4633  ax-iinf 4684  ax-cnex 8113  ax-resscn 8114  ax-1cn 8115  ax-1re 8116  ax-icn 8117  ax-addcl 8118  ax-addrcl 8119  ax-mulcl 8120  ax-mulrcl 8121  ax-addcom 8122  ax-mulcom 8123  ax-addass 8124  ax-mulass 8125  ax-distr 8126  ax-i2m1 8127  ax-0lt1 8128  ax-1rid 8129  ax-0id 8130  ax-rnegex 8131  ax-precex 8132  ax-cnre 8133  ax-pre-ltirr 8134  ax-pre-ltwlin 8135  ax-pre-lttrn 8136  ax-pre-apti 8137  ax-pre-ltadd 8138  ax-pre-mulgt0 8139  ax-pre-mulext 8140  ax-arch 8141  ax-caucvg 8142

This theorem depends on definitions:  df-bi 117  df-stab 836  df-dc 840  df-3or 1003  df-3an 1004  df-tru 1398  df-fal 1401  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-ne 2401  df-nel 2496  df-ral 2513  df-rex 2514  df-reu 2515  df-rmo 2516  df-rab 2517  df-v 2802  df-sbc 3030  df-csb 3126  df-dif 3200  df-un 3202  df-in 3204  df-ss 3211  df-nul 3493  df-if 3604  df-pw 3652  df-sn 3673  df-pr 3674  df-op 3676  df-uni 3892  df-int 3927  df-iun 3970  df-br 4087  df-opab 4149  df-mpt 4150  df-tr 4186  df-id 4388  df-po 4391  df-iso 4392  df-iord 4461  df-on 4463  df-ilim 4464  df-suc 4466  df-iom 4687  df-xp 4729  df-rel 4730  df-cnv 4731  df-co 4732  df-dm 4733  df-rn 4734  df-res 4735  df-ima 4736  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-isom 5333  df-riota 5966  df-ov 6016  df-oprab 6017  df-mpo 6018  df-1st 6298  df-2nd 6299  df-recs 6466  df-frec 6552  df-sup 7174  df-inf 7175  df-pnf 8206  df-mnf 8207  df-xr 8208  df-ltxr 8209  df-le 8210  df-sub 8342  df-neg 8343  df-reap 8745  df-ap 8752  df-div 8843  df-inn 9134  df-2 9192  df-3 9193  df-4 9194  df-5 9195  df-6 9196  df-7 9197  df-8 9198  df-9 9199  df-n0 9393  df-z 9470  df-dec 9602  df-uz 9746  df-q 9844  df-rp 9879  df-fz 10234  df-fzo 10368  df-fl 10520  df-mod 10575  df-seqfrec 10700  df-exp 10791  df-cj 11393  df-re 11394  df-im 11395  df-rsqrt 11549  df-abs 11550  df-dvds 12339  df-gcd 12515  df-lcm 12623

This theorem is referenced by: (None)