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Theorem rpmulcld 9709
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 9674 . 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 2148  (class class class)co 5872    x. cmul 7813   RR+crp 9649
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 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-10 1505  ax-11 1506  ax-i12 1507  ax-bndl 1509  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-13 2150  ax-14 2151  ax-ext 2159  ax-sep 4120  ax-pow 4173  ax-pr 4208  ax-un 4432  ax-setind 4535  ax-cnex 7899  ax-resscn 7900  ax-1re 7902  ax-addrcl 7905  ax-mulrcl 7907  ax-rnegex 7917  ax-pre-mulgt0 7925
This theorem depends on definitions:  df-bi 117  df-3an 980  df-tru 1356  df-fal 1359  df-nf 1461  df-sb 1763  df-eu 2029  df-mo 2030  df-clab 2164  df-cleq 2170  df-clel 2173  df-nfc 2308  df-ne 2348  df-nel 2443  df-ral 2460  df-rex 2461  df-rab 2464  df-v 2739  df-dif 3131  df-un 3133  df-in 3135  df-ss 3142  df-pw 3577  df-sn 3598  df-pr 3599  df-op 3601  df-uni 3810  df-br 4003  df-opab 4064  df-xp 4631  df-pnf 7990  df-mnf 7991  df-ltxr 7993  df-rp 9650
This theorem is referenced by:  qbtwnrelemcalc  10251  cvg1nlemcxze  10984  cvg1nlemres  10987  resqrexlemnm  11020  resqrexlemcvg  11021  reccn2ap  11314  cvgratnnlembern  11524  cvgratnnlemrate  11531  cvgratnn  11532  eirraplem  11777  cosordlem  14141  rpmulcxp  14201
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