Theorem frexr 45958

Description: A function taking real values, is a function taking extended real values. (Contributed by Glauco Siliprandi, 26-Jun-2021.)

Hypothesis

Ref	Expression
frexr.1	⊢ (𝜑 → 𝐹:𝐴⟶ℝ)

Assertion

Ref	Expression
frexr	⊢ (𝜑 → 𝐹:𝐴⟶ℝ*)

Proof of Theorem frexr

Step	Hyp	Ref	Expression
1		frexr.1	. 2 ⊢ (𝜑 → 𝐹:𝐴⟶ℝ)
2		ressxr 11241	. . 3 ⊢ ℝ ⊆ ℝ*
3	2	a1i 11	. 2 ⊢ (𝜑 → ℝ ⊆ ℝ*)
4	1, 3	fssd 6713	1 ⊢ (𝜑 → 𝐹:𝐴⟶ℝ*)

Syntax hints:   → wi 4   ⊆ wss 3907  ⟶wf 6521  ℝcr 11087  ℝ^*cxr 11230

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1818  ax-4 1832  ax-5 1933  ax-6 1990  ax-7 2031  ax-8 2147  ax-9 2155  ax-ext 2737

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-tru 1566  df-ex 1803  df-sb 2094  df-clab 2744  df-cleq 2757  df-clel 2840  df-v 3459  df-un 3912  df-ss 3924  df-f 6529  df-xr 11235

This theorem is referenced by:  limsupubuz  46285  limsupreuz  46309  limsupvaluz2  46310  supcnvlimsup  46312  limsupgtlem  46349  liminflimsupclim  46379  climliminflimsup2  46381  climliminflimsup3  46382  climliminflimsup4  46383  xlimliminflimsup  46434  hoicvr  47120  preimaioomnf  47291  incsmf  47314  issmfle  47317  decsmf  47339  smfsupdmmbllem  47416  smfinfdmmbllem  47420