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Theorem lt2msq 9206
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 9205 . . . 4 |- ( ( ( A e. RR /\ 0 <_ A ) /\ B e. RR /\ A < B ) -> ( A x. A ) < ( B x. B ) )
213expia 1236 . . 3 |- ( ( ( A e. RR /\ 0 <_ A ) /\ B e. RR ) -> ( A < B -> ( A x. A ) < ( B x. B ) ) )
32adantrr 483 . 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 531 . . . . . . 7 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 <_ B ) ) -> A e. RR )
6 lt2msq1 9205 . . . . . . . 8 |- ( ( ( B e. RR /\ 0 <_ B ) /\ A e. RR /\ B < A ) -> ( B x. B ) < ( A x. A ) )
763expia 1236 . . . . . . 7 |- ( ( ( B e. RR /\ 0 <_ B ) /\ A e. RR ) -> ( B < A -> ( B x. B ) < ( A x. A ) ) )
84, 5, 7syl2anc 415 . . . . . 6 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 <_ B ) ) -> ( B < A -> ( B x. B ) < ( A x. A ) ) )
98con3d 640 . . . . 5 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 <_ B ) ) -> ( -. ( B x. B ) < ( A x. A ) -> -. B < A ) )
105, 5remulcld 8346 . . . . . 6 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 <_ B ) ) -> ( A x. A ) e. RR )
11 simprl 535 . . . . . . 7 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 <_ B ) ) -> B e. RR )
1211, 11remulcld 8346 . . . . . 6 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 <_ B ) ) -> ( B x. B ) e. RR )
1310, 12lenltd 8434 . . . . 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 8434 . . . . 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 8344 . . . . . 6 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 <_ B ) ) -> A e. CC )
1711recnd 8344 . . . . . 6 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 <_ B ) ) -> B e. CC )
18 mulext 8932 . . . . . 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 1279 . . . . 5 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 <_ B ) ) -> ( ( A x. A ) # ( B x. B ) -> ( A # B \/ A # B ) ) )
20 oridm 769 . . . . 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 8950 . . . 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 415 . . 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 8950 . . . 4 |- ( ( A e. RR /\ B e. RR ) -> ( A < B <-> ( A <_ B /\ A # B ) ) )
265, 11, 25syl2anc 415 . . 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 720   e. wcel 2209   class class class wbr 4125  (class class class)co 6075   CCcc 8167   RRcr 8168   0cc0 8169   x. cmul 8174   < clt 8350   <_ cle 8351   # cap 8899
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 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4244  ax-pow 4306  ax-pr 4341  ax-un 4573  ax-setind 4679  ax-cnex 8260  ax-resscn 8261  ax-1cn 8262  ax-1re 8263  ax-icn 8264  ax-addcl 8265  ax-addrcl 8266  ax-mulcl 8267  ax-mulrcl 8268  ax-addcom 8269  ax-mulcom 8270  ax-addass 8271  ax-mulass 8272  ax-distr 8273  ax-i2m1 8274  ax-0lt1 8275  ax-1rid 8276  ax-0id 8277  ax-rnegex 8278  ax-precex 8279  ax-cnre 8280  ax-pre-ltirr 8281  ax-pre-ltwlin 8282  ax-pre-lttrn 8283  ax-pre-apti 8284  ax-pre-ltadd 8285  ax-pre-mulgt0 8286  ax-pre-mulext 8287
This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-nel 2516  df-ral 2533  df-rex 2534  df-reu 2535  df-rab 2537  df-v 2823  df-sbc 3052  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-pw 3687  df-sn 3711  df-pr 3712  df-op 3714  df-uni 3931  df-br 4126  df-opab 4188  df-id 4433  df-po 4436  df-iso 4437  df-xp 4775  df-rel 4776  df-cnv 4777  df-co 4778  df-dm 4779  df-iota 5332  df-fun 5374  df-fv 5380  df-riota 6028  df-ov 6078  df-oprab 6079  df-mpo 6080  df-pnf 8352  df-mnf 8353  df-xr 8354  df-ltxr 8355  df-le 8356  df-sub 8489  df-neg 8490  df-reap 8893  df-ap 8900
This theorem is referenced by:  le2msq  9221  lt2msqi  9234  lt2sq  11028
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