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Theorem xaddid1 9798
Description: Extended real version of addid1 8036. (Contributed by Mario Carneiro, 20-Aug-2015.)
Assertion
Ref Expression
xaddid1  |-  ( A  e.  RR*  ->  ( A +e 0 )  =  A )

Proof of Theorem xaddid1
StepHypRef Expression
1 elxr 9712 . 2  |-  ( A  e.  RR*  <->  ( A  e.  RR  \/  A  = +oo  \/  A  = -oo ) )
2 0re 7899 . . . . 5  |-  0  e.  RR
3 rexadd 9788 . . . . 5  |-  ( ( A  e.  RR  /\  0  e.  RR )  ->  ( A +e 0 )  =  ( A  +  0 ) )
42, 3mpan2 422 . . . 4  |-  ( A  e.  RR  ->  ( A +e 0 )  =  ( A  + 
0 ) )
5 recn 7886 . . . . 5  |-  ( A  e.  RR  ->  A  e.  CC )
65addid1d 8047 . . . 4  |-  ( A  e.  RR  ->  ( A  +  0 )  =  A )
74, 6eqtrd 2198 . . 3  |-  ( A  e.  RR  ->  ( A +e 0 )  =  A )
8 0xr 7945 . . . . 5  |-  0  e.  RR*
9 renemnf 7947 . . . . . 6  |-  ( 0  e.  RR  ->  0  =/= -oo )
102, 9ax-mp 5 . . . . 5  |-  0  =/= -oo
11 xaddpnf2 9783 . . . . 5  |-  ( ( 0  e.  RR*  /\  0  =/= -oo )  ->  ( +oo +e 0 )  = +oo )
128, 10, 11mp2an 423 . . . 4  |-  ( +oo +e 0 )  = +oo
13 oveq1 5849 . . . 4  |-  ( A  = +oo  ->  ( A +e 0 )  =  ( +oo +e 0 ) )
14 id 19 . . . 4  |-  ( A  = +oo  ->  A  = +oo )
1512, 13, 143eqtr4a 2225 . . 3  |-  ( A  = +oo  ->  ( A +e 0 )  =  A )
16 renepnf 7946 . . . . . 6  |-  ( 0  e.  RR  ->  0  =/= +oo )
172, 16ax-mp 5 . . . . 5  |-  0  =/= +oo
18 xaddmnf2 9785 . . . . 5  |-  ( ( 0  e.  RR*  /\  0  =/= +oo )  ->  ( -oo +e 0 )  = -oo )
198, 17, 18mp2an 423 . . . 4  |-  ( -oo +e 0 )  = -oo
20 oveq1 5849 . . . 4  |-  ( A  = -oo  ->  ( A +e 0 )  =  ( -oo +e 0 ) )
21 id 19 . . . 4  |-  ( A  = -oo  ->  A  = -oo )
2219, 20, 213eqtr4a 2225 . . 3  |-  ( A  = -oo  ->  ( A +e 0 )  =  A )
237, 15, 223jaoi 1293 . 2  |-  ( ( A  e.  RR  \/  A  = +oo  \/  A  = -oo )  ->  ( A +e 0 )  =  A )
241, 23sylbi 120 1  |-  ( A  e.  RR*  ->  ( A +e 0 )  =  A )
Colors of variables: wff set class
Syntax hints:    -> wi 4    \/ w3o 967    = wceq 1343    e. wcel 2136    =/= wne 2336  (class class class)co 5842   RRcr 7752   0cc0 7753    + caddc 7756   +oocpnf 7930   -oocmnf 7931   RR*cxr 7932   +ecxad 9706
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 604  ax-in2 605  ax-io 699  ax-5 1435  ax-7 1436  ax-gen 1437  ax-ie1 1481  ax-ie2 1482  ax-8 1492  ax-10 1493  ax-11 1494  ax-i12 1495  ax-bndl 1497  ax-4 1498  ax-17 1514  ax-i9 1518  ax-ial 1522  ax-i5r 1523  ax-13 2138  ax-14 2139  ax-ext 2147  ax-sep 4100  ax-pow 4153  ax-pr 4187  ax-un 4411  ax-setind 4514  ax-cnex 7844  ax-resscn 7845  ax-1re 7847  ax-addrcl 7850  ax-0id 7861  ax-rnegex 7862
This theorem depends on definitions:  df-bi 116  df-dc 825  df-3or 969  df-3an 970  df-tru 1346  df-fal 1349  df-nf 1449  df-sb 1751  df-eu 2017  df-mo 2018  df-clab 2152  df-cleq 2158  df-clel 2161  df-nfc 2297  df-ne 2337  df-nel 2432  df-ral 2449  df-rex 2450  df-rab 2453  df-v 2728  df-sbc 2952  df-dif 3118  df-un 3120  df-in 3122  df-ss 3129  df-if 3521  df-pw 3561  df-sn 3582  df-pr 3583  df-op 3585  df-uni 3790  df-br 3983  df-opab 4044  df-id 4271  df-xp 4610  df-rel 4611  df-cnv 4612  df-co 4613  df-dm 4614  df-iota 5153  df-fun 5190  df-fv 5196  df-ov 5845  df-oprab 5846  df-mpo 5847  df-pnf 7935  df-mnf 7936  df-xr 7937  df-xadd 9709
This theorem is referenced by:  xaddid2  9799  xaddid1d  9800  xnn0xadd0  9803  xpncan  9807  psmetsym  12969  psmetge0  12971  xmetge0  13005  xmetsym  13008
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