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Theorem sqrtdiv 11808
Description: Square root distributes over division. (Contributed by Mario Carneiro, 5-May-2016.)
Assertion
Ref Expression
sqrtdiv |- ( ( ( A e. RR /\ 0 <_ A ) /\ B e. RR+ ) -> ( sqr ` ( A / B ) ) = ( ( sqr ` A ) / ( sqr ` B ) ) )
Proof of Theorem sqrtdiv
StepHypRef Expression
1 rerpdivcl 10085 . . . . . 6 |- ( ( A e. RR /\ B e. RR+ ) -> ( A / B ) e. RR )
21adantlr 481 . . . . 5 |- ( ( ( A e. RR /\ 0 <_ A ) /\ B e. RR+ ) -> ( A / B ) e. RR )
3 elrp 10056 . . . . . 6 |- ( B e. RR+ <-> ( B e. RR /\ 0 < B ) )
4 divge0 9203 . . . . . 6 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 < B ) ) -> 0 <_ ( A / B ) )
53, 4sylan2b 287 . . . . 5 |- ( ( ( A e. RR /\ 0 <_ A ) /\ B e. RR+ ) -> 0 <_ ( A / B ) )
6 resqrtcl 11795 . . . . 5 |- ( ( ( A / B ) e. RR /\ 0 <_ ( A / B ) ) -> ( sqr ` ( A / B ) ) e. RR )
72, 5, 6syl2anc 415 . . . 4 |- ( ( ( A e. RR /\ 0 <_ A ) /\ B e. RR+ ) -> ( sqr ` ( A / B ) ) e. RR )
87recnd 8354 . . 3 |- ( ( ( A e. RR /\ 0 <_ A ) /\ B e. RR+ ) -> ( sqr ` ( A / B ) ) e. CC )
9 rpsqrtcl 11807 . . . . 5 |- ( B e. RR+ -> ( sqr ` B ) e. RR+ )
109adantl 277 . . . 4 |- ( ( ( A e. RR /\ 0 <_ A ) /\ B e. RR+ ) -> ( sqr ` B ) e. RR+ )
1110rpcnd 10099 . . 3 |- ( ( ( A e. RR /\ 0 <_ A ) /\ B e. RR+ ) -> ( sqr ` B ) e. CC )
1210rpap0d 10103 . . 3 |- ( ( ( A e. RR /\ 0 <_ A ) /\ B e. RR+ ) -> ( sqr ` B ) # 0 )
138, 11, 12divcanap4d 9126 . 2 |- ( ( ( A e. RR /\ 0 <_ A ) /\ B e. RR+ ) -> ( ( ( sqr ` ( A / B ) ) x. ( sqr ` B ) ) / ( sqr ` B ) ) = ( sqr ` ( A / B ) ) )
14 rprege0 10069 . . . . . 6 |- ( B e. RR+ -> ( B e. RR /\ 0 <_ B ) )
1514adantl 277 . . . . 5 |- ( ( ( A e. RR /\ 0 <_ A ) /\ B e. RR+ ) -> ( B e. RR /\ 0 <_ B ) )
16 sqrtmul 11801 . . . . 5 |- ( ( ( ( A / B ) e. RR /\ 0 <_ ( A / B ) ) /\ ( B e. RR /\ 0 <_ B ) ) -> ( sqr ` ( ( A / B ) x. B ) ) = ( ( sqr ` ( A / B ) ) x. ( sqr ` B ) ) )
172, 5, 15, 16syl21anc 1277 . . . 4 |- ( ( ( A e. RR /\ 0 <_ A ) /\ B e. RR+ ) -> ( sqr ` ( ( A / B ) x. B ) ) = ( ( sqr ` ( A / B ) ) x. ( sqr ` B ) ) )
18 simpll 531 . . . . . . 7 |- ( ( ( A e. RR /\ 0 <_ A ) /\ B e. RR+ ) -> A e. RR )
1918recnd 8354 . . . . . 6 |- ( ( ( A e. RR /\ 0 <_ A ) /\ B e. RR+ ) -> A e. CC )
20 rpcn 10063 . . . . . . 7 |- ( B e. RR+ -> B e. CC )
2120adantl 277 . . . . . 6 |- ( ( ( A e. RR /\ 0 <_ A ) /\ B e. RR+ ) -> B e. CC )
22 rpap0 10071 . . . . . . 7 |- ( B e. RR+ -> B # 0 )
2322adantl 277 . . . . . 6 |- ( ( ( A e. RR /\ 0 <_ A ) /\ B e. RR+ ) -> B # 0 )
2419, 21, 23divcanap1d 9121 . . . . 5 |- ( ( ( A e. RR /\ 0 <_ A ) /\ B e. RR+ ) -> ( ( A / B ) x. B ) = A )
2524fveq2d 5699 . . . 4 |- ( ( ( A e. RR /\ 0 <_ A ) /\ B e. RR+ ) -> ( sqr ` ( ( A / B ) x. B ) ) = ( sqr ` A ) )
2617, 25eqtr3d 2273 . . 3 |- ( ( ( A e. RR /\ 0 <_ A ) /\ B e. RR+ ) -> ( ( sqr ` ( A / B ) ) x. ( sqr ` B ) ) = ( sqr ` A ) )
2726oveq1d 6100 . 2 |- ( ( ( A e. RR /\ 0 <_ A ) /\ B e. RR+ ) -> ( ( ( sqr ` ( A / B ) ) x. ( sqr ` B ) ) / ( sqr ` B ) ) = ( ( sqr ` A ) / ( sqr ` B ) ) )
2813, 27eqtr3d 2273 1 |- ( ( ( A e. RR /\ 0 <_ A ) /\ B e. RR+ ) -> ( sqr ` ( A / B ) ) = ( ( sqr ` A ) / ( sqr ` B ) ) )
Colors of variables:    wff set class
This proof depends on syntax axioms:   -> wi 4   /\ wa 104   = wceq 1402   e. wcel 2209   class class class wbr 4130   ` cfv 5377  (class class class)co 6085   CCcc 8177   RRcr 8178   0cc0 8179   x. cmul 8184   < clt 8360   <_ cle 8361   # cap 8909   / cdiv 9002   RR+crp 10054   sqrcsqrt 11762
This proof depends on 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-coll 4246  ax-sep 4249  ax-nul 4259  ax-pow 4311  ax-pr 4346  ax-un 4578  ax-setind 4684  ax-iinf 4735  ax-cnex 8270  ax-resscn 8271  ax-1cn 8272  ax-1re 8273  ax-icn 8274  ax-addcl 8275  ax-addrcl 8276  ax-mulcl 8277  ax-mulrcl 8278  ax-addcom 8279  ax-mulcom 8280  ax-addass 8281  ax-mulass 8282  ax-distr 8283  ax-i2m1 8284  ax-0lt1 8285  ax-1rid 8286  ax-0id 8287  ax-rnegex 8288  ax-precex 8289  ax-cnre 8290  ax-pre-ltirr 8291  ax-pre-ltwlin 8292  ax-pre-lttrn 8293  ax-pre-apti 8294  ax-pre-ltadd 8295  ax-pre-mulgt0 8296  ax-pre-mulext 8297  ax-arch 8298  ax-caucvg 8299
This proof depends on definitions:  df-bi 117  df-dc 847  df-3or 1010  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-rmo 2536  df-rab 2537  df-v 2823  df-sbc 3052  df-csb 3148  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-if 3639  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-int 3971  df-iun 4014  df-br 4131  df-opab 4193  df-mpt 4194  df-tr 4230  df-id 4438  df-po 4441  df-iso 4442  df-iord 4511  df-on 4513  df-ilim 4514  df-suc 4516  df-iom 4738  df-xp 4780  df-rel 4781  df-cnv 4782  df-co 4783  df-dm 4784  df-rn 4785  df-res 4786  df-ima 4787  df-iota 5337  df-fun 5379  df-fn 5380  df-f 5381  df-f1 5382  df-fo 5383  df-f1o 5384  df-fv 5385  df-riota 6038  df-ov 6088  df-oprab 6089  df-mpo 6090  df-1st 6374  df-2nd 6375  df-recs 6576  df-frec 6662  df-pnf 8362  df-mnf 8363  df-xr 8364  df-ltxr 8365  df-le 8366  df-sub 8499  df-neg 8500  df-reap 8903  df-ap 8910  df-div 9003  df-inn 9305  df-2 9363  df-3 9364  df-4 9365  df-n0 9564  df-z 9645  df-uz 9922  df-rp 10055  df-seqfrec 10885  df-exp 10976  df-rsqrt 11764
This theorem is used by:  sqrtdivd  11934
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