Theorem rpmulcld 9947

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

Step	Hyp	Ref	Expression
1		rpred.1	. 2 |- ( ph -> A e. RR+ )
2		rpaddcld.1	. 2 |- ( ph -> B e. RR+ )
3		rpmulcl 9912	. 2 |- ( ( A e. RR+ /\ B e. RR+ ) -> ( A x. B ) e. RR+ )
4	1, 2, 3	syl2anc 411	1 |- ( ph -> ( A x. B ) e. RR+ )

Syntax hints:   -> wi 4   e. wcel 2202  (class class class)co 6017   x. cmul 8036   RR+crp 9887

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 619  ax-in2 620  ax-io 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-sep 4207  ax-pow 4264  ax-pr 4299  ax-un 4530  ax-setind 4635  ax-cnex 8122  ax-resscn 8123  ax-1re 8125  ax-addrcl 8128  ax-mulrcl 8130  ax-rnegex 8140  ax-pre-mulgt0 8148

This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-fal 1403  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ne 2403  df-nel 2498  df-ral 2515  df-rex 2516  df-rab 2519  df-v 2804  df-dif 3202  df-un 3204  df-in 3206  df-ss 3213  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-br 4089  df-opab 4151  df-xp 4731  df-pnf 8215  df-mnf 8216  df-ltxr 8218  df-rp 9888

This theorem is referenced by:  qbtwnrelemcalc  10514  cvg1nlemcxze  11542  cvg1nlemres  11545  resqrexlemnm  11578  resqrexlemcvg  11579  reccn2ap  11873  cvgratnnlembern  12083  cvgratnnlemrate  12090  cvgratnn  12091  eirraplem  12337  cosordlem  15572  rpmulcxp  15632  lgsquadlem2  15806