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Theorem pythagtriplem10 12778
Description: Lemma for pythagtrip 12792. Show that C - B is positive. (Contributed by Scott Fenton, 17-Apr-2014.) (Revised by Mario Carneiro, 19-Apr-2014.)
Assertion
Ref Expression
pythagtriplem10 |- ( ( ( A e. NN /\ B e. NN /\ C e. NN ) /\ ( ( A ^ 2 ) + ( B ^ 2 ) ) = ( C ^ 2 ) ) -> 0 < ( C - B ) )
Proof of Theorem pythagtriplem10
StepHypRef Expression
1 nnre 9105 . . . . . . . 8 |- ( A e. NN -> A e. RR )
213ad2ant1 1042 . . . . . . 7 |- ( ( A e. NN /\ B e. NN /\ C e. NN ) -> A e. RR )
3 nnap0 9127 . . . . . . . 8 |- ( A e. NN -> A # 0 )
433ad2ant1 1042 . . . . . . 7 |- ( ( A e. NN /\ B e. NN /\ C e. NN ) -> A # 0 )
52, 4sqgt0apd 10910 . . . . . 6 |- ( ( A e. NN /\ B e. NN /\ C e. NN ) -> 0 < ( A ^ 2 ) )
62resqcld 10908 . . . . . . 7 |- ( ( A e. NN /\ B e. NN /\ C e. NN ) -> ( A ^ 2 ) e. RR )
7 nnre 9105 . . . . . . . . 9 |- ( B e. NN -> B e. RR )
873ad2ant2 1043 . . . . . . . 8 |- ( ( A e. NN /\ B e. NN /\ C e. NN ) -> B e. RR )
98resqcld 10908 . . . . . . 7 |- ( ( A e. NN /\ B e. NN /\ C e. NN ) -> ( B ^ 2 ) e. RR )
106, 9ltaddpos2d 8665 . . . . . 6 |- ( ( A e. NN /\ B e. NN /\ C e. NN ) -> ( 0 < ( A ^ 2 ) <-> ( B ^ 2 ) < ( ( A ^ 2 ) + ( B ^ 2 ) ) ) )
115, 10mpbid 147 . . . . 5 |- ( ( A e. NN /\ B e. NN /\ C e. NN ) -> ( B ^ 2 ) < ( ( A ^ 2 ) + ( B ^ 2 ) ) )
1211adantr 276 . . . 4 |- ( ( ( A e. NN /\ B e. NN /\ C e. NN ) /\ ( ( A ^ 2 ) + ( B ^ 2 ) ) = ( C ^ 2 ) ) -> ( B ^ 2 ) < ( ( A ^ 2 ) + ( B ^ 2 ) ) )
13 simpr 110 . . . 4 |- ( ( ( A e. NN /\ B e. NN /\ C e. NN ) /\ ( ( A ^ 2 ) + ( B ^ 2 ) ) = ( C ^ 2 ) ) -> ( ( A ^ 2 ) + ( B ^ 2 ) ) = ( C ^ 2 ) )
1412, 13breqtrd 4108 . . 3 |- ( ( ( A e. NN /\ B e. NN /\ C e. NN ) /\ ( ( A ^ 2 ) + ( B ^ 2 ) ) = ( C ^ 2 ) ) -> ( B ^ 2 ) < ( C ^ 2 ) )
158adantr 276 . . . 4 |- ( ( ( A e. NN /\ B e. NN /\ C e. NN ) /\ ( ( A ^ 2 ) + ( B ^ 2 ) ) = ( C ^ 2 ) ) -> B e. RR )
16 nnre 9105 . . . . . 6 |- ( C e. NN -> C e. RR )
17163ad2ant3 1044 . . . . 5 |- ( ( A e. NN /\ B e. NN /\ C e. NN ) -> C e. RR )
1817adantr 276 . . . 4 |- ( ( ( A e. NN /\ B e. NN /\ C e. NN ) /\ ( ( A ^ 2 ) + ( B ^ 2 ) ) = ( C ^ 2 ) ) -> C e. RR )
19 nnnn0 9364 . . . . . . 7 |- ( B e. NN -> B e. NN0 )
2019nn0ge0d 9413 . . . . . 6 |- ( B e. NN -> 0 <_ B )
21203ad2ant2 1043 . . . . 5 |- ( ( A e. NN /\ B e. NN /\ C e. NN ) -> 0 <_ B )
2221adantr 276 . . . 4 |- ( ( ( A e. NN /\ B e. NN /\ C e. NN ) /\ ( ( A ^ 2 ) + ( B ^ 2 ) ) = ( C ^ 2 ) ) -> 0 <_ B )
23 nnnn0 9364 . . . . . . 7 |- ( C e. NN -> C e. NN0 )
2423nn0ge0d 9413 . . . . . 6 |- ( C e. NN -> 0 <_ C )
25243ad2ant3 1044 . . . . 5 |- ( ( A e. NN /\ B e. NN /\ C e. NN ) -> 0 <_ C )
2625adantr 276 . . . 4 |- ( ( ( A e. NN /\ B e. NN /\ C e. NN ) /\ ( ( A ^ 2 ) + ( B ^ 2 ) ) = ( C ^ 2 ) ) -> 0 <_ C )
2715, 18, 22, 26lt2sqd 10913 . . 3 |- ( ( ( A e. NN /\ B e. NN /\ C e. NN ) /\ ( ( A ^ 2 ) + ( B ^ 2 ) ) = ( C ^ 2 ) ) -> ( B < C <-> ( B ^ 2 ) < ( C ^ 2 ) ) )
2814, 27mpbird 167 . 2 |- ( ( ( A e. NN /\ B e. NN /\ C e. NN ) /\ ( ( A ^ 2 ) + ( B ^ 2 ) ) = ( C ^ 2 ) ) -> B < C )
2915, 18posdifd 8667 . 2 |- ( ( ( A e. NN /\ B e. NN /\ C e. NN ) /\ ( ( A ^ 2 ) + ( B ^ 2 ) ) = ( C ^ 2 ) ) -> ( B < C <-> 0 < ( C - B ) ) )
3028, 29mpbid 147 1 |- ( ( ( A e. NN /\ B e. NN /\ C e. NN ) /\ ( ( A ^ 2 ) + ( B ^ 2 ) ) = ( C ^ 2 ) ) -> 0 < ( C - B ) )
Colors of variables: wff set class
Syntax hints:   -> wi 4   /\ wa 104   /\ w3a 1002   = wceq 1395   e. wcel 2200   class class class wbr 4082  (class class class)co 5994   RRcr 7986   0cc0 7987   + caddc 7990   < clt 8169   <_ cle 8170   - cmin 8305   # cap 8716   NNcn 9098   2c2 9149   ^cexp 10747
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 4198  ax-sep 4201  ax-nul 4209  ax-pow 4257  ax-pr 4292  ax-un 4521  ax-setind 4626  ax-iinf 4677  ax-cnex 8078  ax-resscn 8079  ax-1cn 8080  ax-1re 8081  ax-icn 8082  ax-addcl 8083  ax-addrcl 8084  ax-mulcl 8085  ax-mulrcl 8086  ax-addcom 8087  ax-mulcom 8088  ax-addass 8089  ax-mulass 8090  ax-distr 8091  ax-i2m1 8092  ax-0lt1 8093  ax-1rid 8094  ax-0id 8095  ax-rnegex 8096  ax-precex 8097  ax-cnre 8098  ax-pre-ltirr 8099  ax-pre-ltwlin 8100  ax-pre-lttrn 8101  ax-pre-apti 8102  ax-pre-ltadd 8103  ax-pre-mulgt0 8104  ax-pre-mulext 8105
This theorem depends on definitions:  df-bi 117  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 2801  df-sbc 3029  df-csb 3125  df-dif 3199  df-un 3201  df-in 3203  df-ss 3210  df-nul 3492  df-if 3603  df-pw 3651  df-sn 3672  df-pr 3673  df-op 3675  df-uni 3888  df-int 3923  df-iun 3966  df-br 4083  df-opab 4145  df-mpt 4146  df-tr 4182  df-id 4381  df-po 4384  df-iso 4385  df-iord 4454  df-on 4456  df-ilim 4457  df-suc 4459  df-iom 4680  df-xp 4722  df-rel 4723  df-cnv 4724  df-co 4725  df-dm 4726  df-rn 4727  df-res 4728  df-ima 4729  df-iota 5274  df-fun 5316  df-fn 5317  df-f 5318  df-f1 5319  df-fo 5320  df-f1o 5321  df-fv 5322  df-riota 5947  df-ov 5997  df-oprab 5998  df-mpo 5999  df-1st 6276  df-2nd 6277  df-recs 6441  df-frec 6527  df-pnf 8171  df-mnf 8172  df-xr 8173  df-ltxr 8174  df-le 8175  df-sub 8307  df-neg 8308  df-reap 8710  df-ap 8717  df-div 8808  df-inn 9099  df-2 9157  df-n0 9358  df-z 9435  df-uz 9711  df-seqfrec 10657  df-exp 10748
This theorem is referenced by:  pythagtriplem6  12779  pythagtriplem12  12784  pythagtriplem13  12785  pythagtriplem14  12786  pythagtriplem16  12788
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