Theorem 1xr 8193

Description: 1 is an extended real number. (Contributed by Glauco Siliprandi, 2-Jan-2022.)

Assertion

Ref	Expression
1xr	⊢ 1 ∈ ℝ*

Proof of Theorem 1xr

Step	Hyp	Ref	Expression
1		1re 8133	. 2 ⊢ 1 ∈ ℝ
2	1	rexri 8192	1 ⊢ 1 ∈ ℝ*

Syntax hints:   ∈ wcel 2200  1c1 7988  ℝ^*cxr 8168

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-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-ext 2211  ax-1re 8081

This theorem depends on definitions:  df-bi 117  df-tru 1398  df-nf 1507  df-sb 1809  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-v 2801  df-un 3201  df-in 3203  df-ss 3210  df-xr 8173

This theorem is referenced by:  fprodge1  12136