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Theorem resubcli 8430
Description: Closure law for subtraction of reals. (Contributed by NM, 17-Jan-1997.) (Revised by Mario Carneiro, 27-May-2016.)
Hypotheses
Ref Expression
renegcl.1  |-  A  e.  RR
resubcl.2  |-  B  e.  RR
Assertion
Ref Expression
resubcli  |-  ( A  -  B )  e.  RR

Proof of Theorem resubcli
StepHypRef Expression
1 renegcl.1 . . . 4  |-  A  e.  RR
21recni 8179 . . 3  |-  A  e.  CC
3 resubcl.2 . . . 4  |-  B  e.  RR
43recni 8179 . . 3  |-  B  e.  CC
5 negsub 8415 . . 3  |-  ( ( A  e.  CC  /\  B  e.  CC )  ->  ( A  +  -u B )  =  ( A  -  B ) )
62, 4, 5mp2an 426 . 2  |-  ( A  +  -u B )  =  ( A  -  B
)
73renegcli 8429 . . 3  |-  -u B  e.  RR
81, 7readdcli 8180 . 2  |-  ( A  +  -u B )  e.  RR
96, 8eqeltrri 2303 1  |-  ( A  -  B )  e.  RR
Colors of variables: wff set class
Syntax hints:    = wceq 1395    e. wcel 2200  (class class class)co 6011   CCcc 8018   RRcr 8019    + caddc 8023    - cmin 8338   -ucneg 8339
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-14 2203  ax-ext 2211  ax-sep 4203  ax-pow 4260  ax-pr 4295  ax-setind 4631  ax-resscn 8112  ax-1cn 8113  ax-icn 8115  ax-addcl 8116  ax-addrcl 8117  ax-mulcl 8118  ax-addcom 8120  ax-addass 8122  ax-distr 8124  ax-i2m1 8125  ax-0id 8128  ax-rnegex 8129  ax-cnre 8131
This theorem depends on definitions:  df-bi 117  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-ral 2513  df-rex 2514  df-reu 2515  df-rab 2517  df-v 2802  df-sbc 3030  df-dif 3200  df-un 3202  df-in 3204  df-ss 3211  df-pw 3652  df-sn 3673  df-pr 3674  df-op 3676  df-uni 3890  df-br 4085  df-opab 4147  df-id 4386  df-xp 4727  df-rel 4728  df-cnv 4729  df-co 4730  df-dm 4731  df-iota 5282  df-fun 5324  df-fv 5330  df-riota 5964  df-ov 6014  df-oprab 6015  df-mpo 6016  df-sub 8340  df-neg 8341
This theorem is referenced by:  0reALT  8464
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