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Theorem leaddsub 8617
Description: 'Less than or equal to' relationship between addition and subtraction. (Contributed by NM, 6-Apr-2005.)
Assertion
Ref Expression
leaddsub  |-  ( ( A  e.  RR  /\  B  e.  RR  /\  C  e.  RR )  ->  (
( A  +  B
)  <_  C  <->  A  <_  ( C  -  B ) ) )

Proof of Theorem leaddsub
StepHypRef Expression
1 simp1 1023 . . 3  |-  ( ( A  e.  RR  /\  B  e.  RR  /\  C  e.  RR )  ->  A  e.  RR )
2 simp3 1025 . . . 4  |-  ( ( A  e.  RR  /\  B  e.  RR  /\  C  e.  RR )  ->  C  e.  RR )
3 simp2 1024 . . . 4  |-  ( ( A  e.  RR  /\  B  e.  RR  /\  C  e.  RR )  ->  B  e.  RR )
42, 3resubcld 8559 . . 3  |-  ( ( A  e.  RR  /\  B  e.  RR  /\  C  e.  RR )  ->  ( C  -  B )  e.  RR )
5 leadd1 8609 . . 3  |-  ( ( A  e.  RR  /\  ( C  -  B
)  e.  RR  /\  B  e.  RR )  ->  ( A  <_  ( C  -  B )  <->  ( A  +  B )  <_  ( ( C  -  B )  +  B ) ) )
61, 4, 3, 5syl3anc 1273 . 2  |-  ( ( A  e.  RR  /\  B  e.  RR  /\  C  e.  RR )  ->  ( A  <_  ( C  -  B )  <->  ( A  +  B )  <_  (
( C  -  B
)  +  B ) ) )
72recnd 8207 . . . 4  |-  ( ( A  e.  RR  /\  B  e.  RR  /\  C  e.  RR )  ->  C  e.  CC )
83recnd 8207 . . . 4  |-  ( ( A  e.  RR  /\  B  e.  RR  /\  C  e.  RR )  ->  B  e.  CC )
97, 8npcand 8493 . . 3  |-  ( ( A  e.  RR  /\  B  e.  RR  /\  C  e.  RR )  ->  (
( C  -  B
)  +  B )  =  C )
109breq2d 4100 . 2  |-  ( ( A  e.  RR  /\  B  e.  RR  /\  C  e.  RR )  ->  (
( A  +  B
)  <_  ( ( C  -  B )  +  B )  <->  ( A  +  B )  <_  C
) )
116, 10bitr2d 189 1  |-  ( ( A  e.  RR  /\  B  e.  RR  /\  C  e.  RR )  ->  (
( A  +  B
)  <_  C  <->  A  <_  ( C  -  B ) ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 105    /\ w3a 1004    e. wcel 2202   class class class wbr 4088  (class class class)co 6017   RRcr 8030    + caddc 8034    <_ cle 8214    - cmin 8349
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 619  ax-in2 620  ax-io 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-sep 4207  ax-pow 4264  ax-pr 4299  ax-un 4530  ax-setind 4635  ax-cnex 8122  ax-resscn 8123  ax-1cn 8124  ax-icn 8126  ax-addcl 8127  ax-addrcl 8128  ax-mulcl 8129  ax-addcom 8131  ax-addass 8133  ax-distr 8135  ax-i2m1 8136  ax-0id 8139  ax-rnegex 8140  ax-cnre 8142  ax-pre-ltadd 8147
This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-fal 1403  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ne 2403  df-nel 2498  df-ral 2515  df-rex 2516  df-reu 2517  df-rab 2519  df-v 2804  df-sbc 3032  df-dif 3202  df-un 3204  df-in 3206  df-ss 3213  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-br 4089  df-opab 4151  df-id 4390  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-iota 5286  df-fun 5328  df-fv 5334  df-riota 5970  df-ov 6020  df-oprab 6021  df-mpo 6022  df-pnf 8215  df-mnf 8216  df-xr 8217  df-ltxr 8218  df-le 8219  df-sub 8351  df-neg 8352
This theorem is referenced by:  leaddsub2  8618  lesub  8620  lesub2  8636  subge0  8654  div4p1lem1div2  9397  eluzp1m1  9779  eluzsubi  9783  eluzsub  9785  fzen  10277  fznatpl1  10310  seq3f1olemqsumkj  10772  bcval5  11024  uzwodc  12607  hashdvds  12792
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