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Theorem lt2msq 8930
Description: Two nonnegative numbers compare the same as their squares. (Contributed by Roy F. Longton, 8-Aug-2005.) (Revised by Mario Carneiro, 27-May-2016.)
Assertion
Ref Expression
lt2msq |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 <_ B ) ) -> ( A < B <-> ( A x. A ) < ( B x. B ) ) )
Proof of Theorem lt2msq
StepHypRef Expression
1 lt2msq1 8929 . . . 4 |- ( ( ( A e. RR /\ 0 <_ A ) /\ B e. RR /\ A < B ) -> ( A x. A ) < ( B x. B ) )
213expia 1207 . . 3 |- ( ( ( A e. RR /\ 0 <_ A ) /\ B e. RR ) -> ( A < B -> ( A x. A ) < ( B x. B ) ) )
32adantrr 479 . 2 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 <_ B ) ) -> ( A < B -> ( A x. A ) < ( B x. B ) ) )
4 simpr 110 . . . . . . 7 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 <_ B ) ) -> ( B e. RR /\ 0 <_ B ) )
5 simpll 527 . . . . . . 7 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 <_ B ) ) -> A e. RR )
6 lt2msq1 8929 . . . . . . . 8 |- ( ( ( B e. RR /\ 0 <_ B ) /\ A e. RR /\ B < A ) -> ( B x. B ) < ( A x. A ) )
763expia 1207 . . . . . . 7 |- ( ( ( B e. RR /\ 0 <_ B ) /\ A e. RR ) -> ( B < A -> ( B x. B ) < ( A x. A ) ) )
84, 5, 7syl2anc 411 . . . . . 6 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 <_ B ) ) -> ( B < A -> ( B x. B ) < ( A x. A ) ) )
98con3d 632 . . . . 5 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 <_ B ) ) -> ( -. ( B x. B ) < ( A x. A ) -> -. B < A ) )
105, 5remulcld 8074 . . . . . 6 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 <_ B ) ) -> ( A x. A ) e. RR )
11 simprl 529 . . . . . . 7 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 <_ B ) ) -> B e. RR )
1211, 11remulcld 8074 . . . . . 6 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 <_ B ) ) -> ( B x. B ) e. RR )
1310, 12lenltd 8161 . . . . 5 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 <_ B ) ) -> ( ( A x. A ) <_ ( B x. B ) <-> -. ( B x. B ) < ( A x. A ) ) )
145, 11lenltd 8161 . . . . 5 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 <_ B ) ) -> ( A <_ B <-> -. B < A ) )
159, 13, 143imtr4d 203 . . . 4 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 <_ B ) ) -> ( ( A x. A ) <_ ( B x. B ) -> A <_ B ) )
165recnd 8072 . . . . . 6 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 <_ B ) ) -> A e. CC )
1711recnd 8072 . . . . . 6 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 <_ B ) ) -> B e. CC )
18 mulext 8658 . . . . . 6 |- ( ( ( A e. CC /\ A e. CC ) /\ ( B e. CC /\ B e. CC ) ) -> ( ( A x. A ) # ( B x. B ) -> ( A # B \/ A # B ) ) )
1916, 16, 17, 17, 18syl22anc 1250 . . . . 5 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 <_ B ) ) -> ( ( A x. A ) # ( B x. B ) -> ( A # B \/ A # B ) ) )
20 oridm 758 . . . . 5 |- ( ( A # B \/ A # B ) <-> A # B )
2119, 20imbitrdi 161 . . . 4 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 <_ B ) ) -> ( ( A x. A ) # ( B x. B ) -> A # B ) )
2215, 21anim12d 335 . . 3 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 <_ B ) ) -> ( ( ( A x. A ) <_ ( B x. B ) /\ ( A x. A ) # ( B x. B ) ) -> ( A <_ B /\ A # B ) ) )
23 ltleap 8676 . . . 4 |- ( ( ( A x. A ) e. RR /\ ( B x. B ) e. RR ) -> ( ( A x. A ) < ( B x. B ) <-> ( ( A x. A ) <_ ( B x. B ) /\ ( A x. A ) # ( B x. B ) ) ) )
2410, 12, 23syl2anc 411 . . 3 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 <_ B ) ) -> ( ( A x. A ) < ( B x. B ) <-> ( ( A x. A ) <_ ( B x. B ) /\ ( A x. A ) # ( B x. B ) ) ) )
25 ltleap 8676 . . . 4 |- ( ( A e. RR /\ B e. RR ) -> ( A < B <-> ( A <_ B /\ A # B ) ) )
265, 11, 25syl2anc 411 . . 3 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 <_ B ) ) -> ( A < B <-> ( A <_ B /\ A # B ) ) )
2722, 24, 263imtr4d 203 . 2 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 <_ B ) ) -> ( ( A x. A ) < ( B x. B ) -> A < B ) )
283, 27impbid 129 1 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 <_ B ) ) -> ( A < B <-> ( A x. A ) < ( B x. B ) ) )
Colors of variables: wff set class
Syntax hints:   -. wn 3   -> wi 4   /\ wa 104   <-> wb 105   \/ wo 709   e. wcel 2167   class class class wbr 4034  (class class class)co 5925   CCcc 7894   RRcr 7895   0cc0 7896   x. cmul 7901   < clt 8078   <_ cle 8079   # cap 8625
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 615  ax-in2 616  ax-io 710  ax-5 1461  ax-7 1462  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-8 1518  ax-10 1519  ax-11 1520  ax-i12 1521  ax-bndl 1523  ax-4 1524  ax-17 1540  ax-i9 1544  ax-ial 1548  ax-i5r 1549  ax-13 2169  ax-14 2170  ax-ext 2178  ax-sep 4152  ax-pow 4208  ax-pr 4243  ax-un 4469  ax-setind 4574  ax-cnex 7987  ax-resscn 7988  ax-1cn 7989  ax-1re 7990  ax-icn 7991  ax-addcl 7992  ax-addrcl 7993  ax-mulcl 7994  ax-mulrcl 7995  ax-addcom 7996  ax-mulcom 7997  ax-addass 7998  ax-mulass 7999  ax-distr 8000  ax-i2m1 8001  ax-0lt1 8002  ax-1rid 8003  ax-0id 8004  ax-rnegex 8005  ax-precex 8006  ax-cnre 8007  ax-pre-ltirr 8008  ax-pre-ltwlin 8009  ax-pre-lttrn 8010  ax-pre-apti 8011  ax-pre-ltadd 8012  ax-pre-mulgt0 8013  ax-pre-mulext 8014
This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  df-fal 1370  df-nf 1475  df-sb 1777  df-eu 2048  df-mo 2049  df-clab 2183  df-cleq 2189  df-clel 2192  df-nfc 2328  df-ne 2368  df-nel 2463  df-ral 2480  df-rex 2481  df-reu 2482  df-rab 2484  df-v 2765  df-sbc 2990  df-dif 3159  df-un 3161  df-in 3163  df-ss 3170  df-pw 3608  df-sn 3629  df-pr 3630  df-op 3632  df-uni 3841  df-br 4035  df-opab 4096  df-id 4329  df-po 4332  df-iso 4333  df-xp 4670  df-rel 4671  df-cnv 4672  df-co 4673  df-dm 4674  df-iota 5220  df-fun 5261  df-fv 5267  df-riota 5880  df-ov 5928  df-oprab 5929  df-mpo 5930  df-pnf 8080  df-mnf 8081  df-xr 8082  df-ltxr 8083  df-le 8084  df-sub 8216  df-neg 8217  df-reap 8619  df-ap 8626
This theorem is referenced by:  le2msq  8945  lt2msqi  8958  lt2sq  10722
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