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Theorem opoe 14419
Description: The sum of two odds is even. (Contributed by Scott Fenton, 7-Apr-2014.) (Revised by Mario Carneiro, 19-Apr-2014.)
Assertion
Ref Expression
opoe  |-  ( ( ( A  e.  ZZ  /\ 
-.  2  ||  A
)  /\  ( B  e.  ZZ  /\  -.  2  ||  B ) )  -> 
2  ||  ( A  +  B ) )

Proof of Theorem opoe
Dummy variables  a 
b are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 odd2np1 14130 . . . . 5  |-  ( A  e.  ZZ  ->  ( -.  2  ||  A  <->  E. a  e.  ZZ  ( ( 2  x.  a )  +  1 )  =  A ) )
2 odd2np1 14130 . . . . 5  |-  ( B  e.  ZZ  ->  ( -.  2  ||  B  <->  E. b  e.  ZZ  ( ( 2  x.  b )  +  1 )  =  B ) )
31, 2bi2anan9 871 . . . 4  |-  ( ( A  e.  ZZ  /\  B  e.  ZZ )  ->  ( ( -.  2  ||  A  /\  -.  2  ||  B )  <->  ( E. a  e.  ZZ  (
( 2  x.  a
)  +  1 )  =  A  /\  E. b  e.  ZZ  (
( 2  x.  b
)  +  1 )  =  B ) ) )
4 reeanv 3022 . . . . 5  |-  ( E. a  e.  ZZ  E. b  e.  ZZ  (
( ( 2  x.  a )  +  1 )  =  A  /\  ( ( 2  x.  b )  +  1 )  =  B )  <-> 
( E. a  e.  ZZ  ( ( 2  x.  a )  +  1 )  =  A  /\  E. b  e.  ZZ  ( ( 2  x.  b )  +  1 )  =  B ) )
5 2z 10892 . . . . . . . . 9  |-  2  e.  ZZ
6 zaddcl 10900 . . . . . . . . . 10  |-  ( ( a  e.  ZZ  /\  b  e.  ZZ )  ->  ( a  +  b )  e.  ZZ )
76peano2zd 10968 . . . . . . . . 9  |-  ( ( a  e.  ZZ  /\  b  e.  ZZ )  ->  ( ( a  +  b )  +  1 )  e.  ZZ )
8 dvdsmul1 14089 . . . . . . . . 9  |-  ( ( 2  e.  ZZ  /\  ( ( a  +  b )  +  1 )  e.  ZZ )  ->  2  ||  (
2  x.  ( ( a  +  b )  +  1 ) ) )
95, 7, 8sylancr 661 . . . . . . . 8  |-  ( ( a  e.  ZZ  /\  b  e.  ZZ )  ->  2  ||  ( 2  x.  ( ( a  +  b )  +  1 ) ) )
10 zcn 10865 . . . . . . . . 9  |-  ( a  e.  ZZ  ->  a  e.  CC )
11 zcn 10865 . . . . . . . . 9  |-  ( b  e.  ZZ  ->  b  e.  CC )
12 addcl 9563 . . . . . . . . . . . . 13  |-  ( ( a  e.  CC  /\  b  e.  CC )  ->  ( a  +  b )  e.  CC )
13 2cn 10602 . . . . . . . . . . . . . 14  |-  2  e.  CC
14 ax-1cn 9539 . . . . . . . . . . . . . 14  |-  1  e.  CC
15 adddi 9570 . . . . . . . . . . . . . 14  |-  ( ( 2  e.  CC  /\  ( a  +  b )  e.  CC  /\  1  e.  CC )  ->  ( 2  x.  (
( a  +  b )  +  1 ) )  =  ( ( 2  x.  ( a  +  b ) )  +  ( 2  x.  1 ) ) )
1613, 14, 15mp3an13 1313 . . . . . . . . . . . . 13  |-  ( ( a  +  b )  e.  CC  ->  (
2  x.  ( ( a  +  b )  +  1 ) )  =  ( ( 2  x.  ( a  +  b ) )  +  ( 2  x.  1 ) ) )
1712, 16syl 16 . . . . . . . . . . . 12  |-  ( ( a  e.  CC  /\  b  e.  CC )  ->  ( 2  x.  (
( a  +  b )  +  1 ) )  =  ( ( 2  x.  ( a  +  b ) )  +  ( 2  x.  1 ) ) )
18 adddi 9570 . . . . . . . . . . . . . 14  |-  ( ( 2  e.  CC  /\  a  e.  CC  /\  b  e.  CC )  ->  (
2  x.  ( a  +  b ) )  =  ( ( 2  x.  a )  +  ( 2  x.  b
) ) )
1913, 18mp3an1 1309 . . . . . . . . . . . . 13  |-  ( ( a  e.  CC  /\  b  e.  CC )  ->  ( 2  x.  (
a  +  b ) )  =  ( ( 2  x.  a )  +  ( 2  x.  b ) ) )
2019oveq1d 6285 . . . . . . . . . . . 12  |-  ( ( a  e.  CC  /\  b  e.  CC )  ->  ( ( 2  x.  ( a  +  b ) )  +  ( 2  x.  1 ) )  =  ( ( ( 2  x.  a
)  +  ( 2  x.  b ) )  +  ( 2  x.  1 ) ) )
2117, 20eqtrd 2495 . . . . . . . . . . 11  |-  ( ( a  e.  CC  /\  b  e.  CC )  ->  ( 2  x.  (
( a  +  b )  +  1 ) )  =  ( ( ( 2  x.  a
)  +  ( 2  x.  b ) )  +  ( 2  x.  1 ) ) )
22 2t1e2 10680 . . . . . . . . . . . . 13  |-  ( 2  x.  1 )  =  2
23 df-2 10590 . . . . . . . . . . . . 13  |-  2  =  ( 1  +  1 )
2422, 23eqtri 2483 . . . . . . . . . . . 12  |-  ( 2  x.  1 )  =  ( 1  +  1 )
2524oveq2i 6281 . . . . . . . . . . 11  |-  ( ( ( 2  x.  a
)  +  ( 2  x.  b ) )  +  ( 2  x.  1 ) )  =  ( ( ( 2  x.  a )  +  ( 2  x.  b
) )  +  ( 1  +  1 ) )
2621, 25syl6eq 2511 . . . . . . . . . 10  |-  ( ( a  e.  CC  /\  b  e.  CC )  ->  ( 2  x.  (
( a  +  b )  +  1 ) )  =  ( ( ( 2  x.  a
)  +  ( 2  x.  b ) )  +  ( 1  +  1 ) ) )
27 mulcl 9565 . . . . . . . . . . . 12  |-  ( ( 2  e.  CC  /\  a  e.  CC )  ->  ( 2  x.  a
)  e.  CC )
2813, 27mpan 668 . . . . . . . . . . 11  |-  ( a  e.  CC  ->  (
2  x.  a )  e.  CC )
29 mulcl 9565 . . . . . . . . . . . 12  |-  ( ( 2  e.  CC  /\  b  e.  CC )  ->  ( 2  x.  b
)  e.  CC )
3013, 29mpan 668 . . . . . . . . . . 11  |-  ( b  e.  CC  ->  (
2  x.  b )  e.  CC )
31 add4 9785 . . . . . . . . . . . 12  |-  ( ( ( ( 2  x.  a )  e.  CC  /\  ( 2  x.  b
)  e.  CC )  /\  ( 1  e.  CC  /\  1  e.  CC ) )  -> 
( ( ( 2  x.  a )  +  ( 2  x.  b
) )  +  ( 1  +  1 ) )  =  ( ( ( 2  x.  a
)  +  1 )  +  ( ( 2  x.  b )  +  1 ) ) )
3214, 14, 31mpanr12 683 . . . . . . . . . . 11  |-  ( ( ( 2  x.  a
)  e.  CC  /\  ( 2  x.  b
)  e.  CC )  ->  ( ( ( 2  x.  a )  +  ( 2  x.  b ) )  +  ( 1  +  1 ) )  =  ( ( ( 2  x.  a )  +  1 )  +  ( ( 2  x.  b )  +  1 ) ) )
3328, 30, 32syl2an 475 . . . . . . . . . 10  |-  ( ( a  e.  CC  /\  b  e.  CC )  ->  ( ( ( 2  x.  a )  +  ( 2  x.  b
) )  +  ( 1  +  1 ) )  =  ( ( ( 2  x.  a
)  +  1 )  +  ( ( 2  x.  b )  +  1 ) ) )
3426, 33eqtrd 2495 . . . . . . . . 9  |-  ( ( a  e.  CC  /\  b  e.  CC )  ->  ( 2  x.  (
( a  +  b )  +  1 ) )  =  ( ( ( 2  x.  a
)  +  1 )  +  ( ( 2  x.  b )  +  1 ) ) )
3510, 11, 34syl2an 475 . . . . . . . 8  |-  ( ( a  e.  ZZ  /\  b  e.  ZZ )  ->  ( 2  x.  (
( a  +  b )  +  1 ) )  =  ( ( ( 2  x.  a
)  +  1 )  +  ( ( 2  x.  b )  +  1 ) ) )
369, 35breqtrd 4463 . . . . . . 7  |-  ( ( a  e.  ZZ  /\  b  e.  ZZ )  ->  2  ||  ( ( ( 2  x.  a
)  +  1 )  +  ( ( 2  x.  b )  +  1 ) ) )
37 oveq12 6279 . . . . . . . 8  |-  ( ( ( ( 2  x.  a )  +  1 )  =  A  /\  ( ( 2  x.  b )  +  1 )  =  B )  ->  ( ( ( 2  x.  a )  +  1 )  +  ( ( 2  x.  b )  +  1 ) )  =  ( A  +  B ) )
3837breq2d 4451 . . . . . . 7  |-  ( ( ( ( 2  x.  a )  +  1 )  =  A  /\  ( ( 2  x.  b )  +  1 )  =  B )  ->  ( 2  ||  ( ( ( 2  x.  a )  +  1 )  +  ( ( 2  x.  b
)  +  1 ) )  <->  2  ||  ( A  +  B )
) )
3936, 38syl5ibcom 220 . . . . . 6  |-  ( ( a  e.  ZZ  /\  b  e.  ZZ )  ->  ( ( ( ( 2  x.  a )  +  1 )  =  A  /\  ( ( 2  x.  b )  +  1 )  =  B )  ->  2  ||  ( A  +  B
) ) )
4039rexlimivv 2951 . . . . 5  |-  ( E. a  e.  ZZ  E. b  e.  ZZ  (
( ( 2  x.  a )  +  1 )  =  A  /\  ( ( 2  x.  b )  +  1 )  =  B )  ->  2  ||  ( A  +  B )
)
414, 40sylbir 213 . . . 4  |-  ( ( E. a  e.  ZZ  ( ( 2  x.  a )  +  1 )  =  A  /\  E. b  e.  ZZ  (
( 2  x.  b
)  +  1 )  =  B )  -> 
2  ||  ( A  +  B ) )
423, 41syl6bi 228 . . 3  |-  ( ( A  e.  ZZ  /\  B  e.  ZZ )  ->  ( ( -.  2  ||  A  /\  -.  2  ||  B )  ->  2  ||  ( A  +  B
) ) )
4342imp 427 . 2  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( -.  2  ||  A  /\  -.  2  ||  B ) )  -> 
2  ||  ( A  +  B ) )
4443an4s 824 1  |-  ( ( ( A  e.  ZZ  /\ 
-.  2  ||  A
)  /\  ( B  e.  ZZ  /\  -.  2  ||  B ) )  -> 
2  ||  ( A  +  B ) )
Colors of variables: wff setvar class
Syntax hints:   -. wn 3    -> wi 4    /\ wa 367    = wceq 1398    e. wcel 1823   E.wrex 2805   class class class wbr 4439  (class class class)co 6270   CCcc 9479   1c1 9482    + caddc 9484    x. cmul 9486   2c2 10581   ZZcz 10860    || cdvds 14070
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1623  ax-4 1636  ax-5 1709  ax-6 1752  ax-7 1795  ax-8 1825  ax-9 1827  ax-10 1842  ax-11 1847  ax-12 1859  ax-13 2004  ax-ext 2432  ax-sep 4560  ax-nul 4568  ax-pow 4615  ax-pr 4676  ax-un 6565  ax-resscn 9538  ax-1cn 9539  ax-icn 9540  ax-addcl 9541  ax-addrcl 9542  ax-mulcl 9543  ax-mulrcl 9544  ax-mulcom 9545  ax-addass 9546  ax-mulass 9547  ax-distr 9548  ax-i2m1 9549  ax-1ne0 9550  ax-1rid 9551  ax-rnegex 9552  ax-rrecex 9553  ax-cnre 9554  ax-pre-lttri 9555  ax-pre-lttrn 9556  ax-pre-ltadd 9557  ax-pre-mulgt0 9558
This theorem depends on definitions:  df-bi 185  df-or 368  df-an 369  df-3or 972  df-3an 973  df-tru 1401  df-ex 1618  df-nf 1622  df-sb 1745  df-eu 2288  df-mo 2289  df-clab 2440  df-cleq 2446  df-clel 2449  df-nfc 2604  df-ne 2651  df-nel 2652  df-ral 2809  df-rex 2810  df-reu 2811  df-rmo 2812  df-rab 2813  df-v 3108  df-sbc 3325  df-csb 3421  df-dif 3464  df-un 3466  df-in 3468  df-ss 3475  df-pss 3477  df-nul 3784  df-if 3930  df-pw 4001  df-sn 4017  df-pr 4019  df-tp 4021  df-op 4023  df-uni 4236  df-iun 4317  df-br 4440  df-opab 4498  df-mpt 4499  df-tr 4533  df-eprel 4780  df-id 4784  df-po 4789  df-so 4790  df-fr 4827  df-we 4829  df-ord 4870  df-on 4871  df-lim 4872  df-suc 4873  df-xp 4994  df-rel 4995  df-cnv 4996  df-co 4997  df-dm 4998  df-rn 4999  df-res 5000  df-ima 5001  df-iota 5534  df-fun 5572  df-fn 5573  df-f 5574  df-f1 5575  df-fo 5576  df-f1o 5577  df-fv 5578  df-riota 6232  df-ov 6273  df-oprab 6274  df-mpt2 6275  df-om 6674  df-recs 7034  df-rdg 7068  df-er 7303  df-en 7510  df-dom 7511  df-sdom 7512  df-pnf 9619  df-mnf 9620  df-xr 9621  df-ltxr 9622  df-le 9623  df-sub 9798  df-neg 9799  df-div 10203  df-nn 10532  df-2 10590  df-n0 10792  df-z 10861  df-dvds 14071
This theorem is referenced by:  pythagtriplem11  14433  prmlem0  14675  eupath2lem3  25181
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