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Theorem rpmulcld 9779
Description: Closure law for multiplication of positive reals. Part of Axiom 7 of [Apostol] p. 20. (Contributed by Mario Carneiro, 28-May-2016.)
Hypotheses
Ref Expression
rpred.1  |-  ( ph  ->  A  e.  RR+ )
rpaddcld.1  |-  ( ph  ->  B  e.  RR+ )
Assertion
Ref Expression
rpmulcld  |-  ( ph  ->  ( A  x.  B
)  e.  RR+ )

Proof of Theorem rpmulcld
StepHypRef Expression
1 rpred.1 . 2  |-  ( ph  ->  A  e.  RR+ )
2 rpaddcld.1 . 2  |-  ( ph  ->  B  e.  RR+ )
3 rpmulcl 9744 . 2  |-  ( ( A  e.  RR+  /\  B  e.  RR+ )  ->  ( A  x.  B )  e.  RR+ )
41, 2, 3syl2anc 411 1  |-  ( ph  ->  ( A  x.  B
)  e.  RR+ )
Colors of variables: wff set class
Syntax hints:    -> wi 4    e. wcel 2164  (class class class)co 5918    x. cmul 7877   RR+crp 9719
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 1458  ax-7 1459  ax-gen 1460  ax-ie1 1504  ax-ie2 1505  ax-8 1515  ax-10 1516  ax-11 1517  ax-i12 1518  ax-bndl 1520  ax-4 1521  ax-17 1537  ax-i9 1541  ax-ial 1545  ax-i5r 1546  ax-13 2166  ax-14 2167  ax-ext 2175  ax-sep 4147  ax-pow 4203  ax-pr 4238  ax-un 4464  ax-setind 4569  ax-cnex 7963  ax-resscn 7964  ax-1re 7966  ax-addrcl 7969  ax-mulrcl 7971  ax-rnegex 7981  ax-pre-mulgt0 7989
This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  df-fal 1370  df-nf 1472  df-sb 1774  df-eu 2045  df-mo 2046  df-clab 2180  df-cleq 2186  df-clel 2189  df-nfc 2325  df-ne 2365  df-nel 2460  df-ral 2477  df-rex 2478  df-rab 2481  df-v 2762  df-dif 3155  df-un 3157  df-in 3159  df-ss 3166  df-pw 3603  df-sn 3624  df-pr 3625  df-op 3627  df-uni 3836  df-br 4030  df-opab 4091  df-xp 4665  df-pnf 8056  df-mnf 8057  df-ltxr 8059  df-rp 9720
This theorem is referenced by:  qbtwnrelemcalc  10324  cvg1nlemcxze  11126  cvg1nlemres  11129  resqrexlemnm  11162  resqrexlemcvg  11163  reccn2ap  11456  cvgratnnlembern  11666  cvgratnnlemrate  11673  cvgratnn  11674  eirraplem  11920  cosordlem  14984  rpmulcxp  15044
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