Theorem rpxrd 8774

Description: A positive real is an extended real. (Contributed by Mario Carneiro, 28-May-2016.)

Hypothesis

Ref	Expression
rpred.1	⊢ (𝜑 → 𝐴 ∈ ℝ+)

Assertion

Ref	Expression
rpxrd	⊢ (𝜑 → 𝐴 ∈ ℝ*)

Proof of Theorem rpxrd

Step	Hyp	Ref	Expression
1		rpred.1	. . 3 ⊢ (𝜑 → 𝐴 ∈ ℝ+)
2	1	rpred 8773	. 2 ⊢ (𝜑 → 𝐴 ∈ ℝ)
3	2	rexrd 7168	1 ⊢ (𝜑 → 𝐴 ∈ ℝ*)

Syntax hints:   → wi 4   ∈ wcel 1433  ℝ^*cxr 7152  ℝ⁺crp 8734

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-io 662  ax-5 1376  ax-7 1377  ax-gen 1378  ax-ie1 1422  ax-ie2 1423  ax-8 1435  ax-10 1436  ax-11 1437  ax-i12 1438  ax-bndl 1439  ax-4 1440  ax-17 1459  ax-i9 1463  ax-ial 1467  ax-i5r 1468  ax-ext 2063

This theorem depends on definitions:  df-bi 115  df-tru 1287  df-nf 1390  df-sb 1686  df-clab 2068  df-cleq 2074  df-clel 2077  df-nfc 2208  df-rab 2357  df-v 2603  df-un 2977  df-in 2979  df-ss 2986  df-xr 7157  df-rp 8735

This theorem is referenced by: (None)