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Theorem rpmulcld 9682
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 9647 . 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 2146  (class class class)co 5865    x. cmul 7791   RR+crp 9622
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 614  ax-in2 615  ax-io 709  ax-5 1445  ax-7 1446  ax-gen 1447  ax-ie1 1491  ax-ie2 1492  ax-8 1502  ax-10 1503  ax-11 1504  ax-i12 1505  ax-bndl 1507  ax-4 1508  ax-17 1524  ax-i9 1528  ax-ial 1532  ax-i5r 1533  ax-13 2148  ax-14 2149  ax-ext 2157  ax-sep 4116  ax-pow 4169  ax-pr 4203  ax-un 4427  ax-setind 4530  ax-cnex 7877  ax-resscn 7878  ax-1re 7880  ax-addrcl 7883  ax-mulrcl 7885  ax-rnegex 7895  ax-pre-mulgt0 7903
This theorem depends on definitions:  df-bi 117  df-3an 980  df-tru 1356  df-fal 1359  df-nf 1459  df-sb 1761  df-eu 2027  df-mo 2028  df-clab 2162  df-cleq 2168  df-clel 2171  df-nfc 2306  df-ne 2346  df-nel 2441  df-ral 2458  df-rex 2459  df-rab 2462  df-v 2737  df-dif 3129  df-un 3131  df-in 3133  df-ss 3140  df-pw 3574  df-sn 3595  df-pr 3596  df-op 3598  df-uni 3806  df-br 3999  df-opab 4060  df-xp 4626  df-pnf 7968  df-mnf 7969  df-ltxr 7971  df-rp 9623
This theorem is referenced by:  qbtwnrelemcalc  10224  cvg1nlemcxze  10957  cvg1nlemres  10960  resqrexlemnm  10993  resqrexlemcvg  10994  reccn2ap  11287  cvgratnnlembern  11497  cvgratnnlemrate  11504  cvgratnn  11505  eirraplem  11750  cosordlem  13839  rpmulcxp  13899
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