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Theorem rpmulcld 9670
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 9635 . 2  |-  ( ( A  e.  RR+  /\  B  e.  RR+ )  ->  ( A  x.  B )  e.  RR+ )
41, 2, 3syl2anc 409 1  |-  ( ph  ->  ( A  x.  B
)  e.  RR+ )
Colors of variables: wff set class
Syntax hints:    -> wi 4    e. wcel 2141  (class class class)co 5853    x. cmul 7779   RR+crp 9610
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 609  ax-in2 610  ax-io 704  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-10 1498  ax-11 1499  ax-i12 1500  ax-bndl 1502  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-13 2143  ax-14 2144  ax-ext 2152  ax-sep 4107  ax-pow 4160  ax-pr 4194  ax-un 4418  ax-setind 4521  ax-cnex 7865  ax-resscn 7866  ax-1re 7868  ax-addrcl 7871  ax-mulrcl 7873  ax-rnegex 7883  ax-pre-mulgt0 7891
This theorem depends on definitions:  df-bi 116  df-3an 975  df-tru 1351  df-fal 1354  df-nf 1454  df-sb 1756  df-eu 2022  df-mo 2023  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-ne 2341  df-nel 2436  df-ral 2453  df-rex 2454  df-rab 2457  df-v 2732  df-dif 3123  df-un 3125  df-in 3127  df-ss 3134  df-pw 3568  df-sn 3589  df-pr 3590  df-op 3592  df-uni 3797  df-br 3990  df-opab 4051  df-xp 4617  df-pnf 7956  df-mnf 7957  df-ltxr 7959  df-rp 9611
This theorem is referenced by:  qbtwnrelemcalc  10212  cvg1nlemcxze  10946  cvg1nlemres  10949  resqrexlemnm  10982  resqrexlemcvg  10983  reccn2ap  11276  cvgratnnlembern  11486  cvgratnnlemrate  11493  cvgratnn  11494  eirraplem  11739  cosordlem  13564  rpmulcxp  13624
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