Theorem rexrd 7075

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

Hypothesis

Ref	Expression
rexrd.1	⊢ (𝜑 → 𝐴 ∈ ℝ)

Assertion

Ref	Expression
rexrd	⊢ (𝜑 → 𝐴 ∈ ℝ*)

Proof of Theorem rexrd

Step	Hyp	Ref	Expression
1		ressxr 7069	. 2 ⊢ ℝ ⊆ ℝ*
2		rexrd.1	. 2 ⊢ (𝜑 → 𝐴 ∈ ℝ)
3	1, 2	sseldi 2943	1 ⊢ (𝜑 → 𝐴 ∈ ℝ*)

Syntax hints:   → wi 4   ∈ wcel 1393  ℝcr 6888  ℝ^*cxr 7059

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-io 630  ax-5 1336  ax-7 1337  ax-gen 1338  ax-ie1 1382  ax-ie2 1383  ax-8 1395  ax-10 1396  ax-11 1397  ax-i12 1398  ax-bndl 1399  ax-4 1400  ax-17 1419  ax-i9 1423  ax-ial 1427  ax-i5r 1428  ax-ext 2022

This theorem depends on definitions:  df-bi 110  df-tru 1246  df-nf 1350  df-sb 1646  df-clab 2027  df-cleq 2033  df-clel 2036  df-nfc 2167  df-v 2559  df-un 2922  df-in 2924  df-ss 2931  df-xr 7064

This theorem is referenced by:  rpxr  8590  rpxrd  8623  xnegcl  8745  iooshf  8821  icoshftf1o  8859  modqelico  9176  elicc4abs  9690