Theorem frexr 46080

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 11254	. . 3 ⊢ ℝ ⊆ ℝ*
3	2	a1i 11	. 2 ⊢ (𝜑 → ℝ ⊆ ℝ*)
4	1, 3	fssd 6725	1 ⊢ (𝜑 → 𝐹:𝐴⟶ℝ*)

Syntax hints:   → wi 4   ⊆ wss 3906  ⟶wf 6534  ℝcr 11100  ℝ^*cxr 11243

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1825  ax-4 1839  ax-5 1940  ax-6 1997  ax-7 2038  ax-8 2145  ax-9 2153  ax-ext 2735

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-tru 1573  df-ex 1810  df-sb 2097  df-clab 2742  df-cleq 2755  df-clel 2838  df-v 3457  df-un 3911  df-ss 3923  df-f 6542  df-xr 11248

This theorem is referenced by:  limsupubuz  46407  limsupreuz  46431  limsupvaluz2  46432  supcnvlimsup  46434  limsupgtlem  46471  liminflimsupclim  46501  climliminflimsup2  46503  climliminflimsup3  46504  climliminflimsup4  46505  xlimliminflimsup  46556  hoicvr  47242  preimaioomnf  47413  incsmf  47436  issmfle  47439  decsmf  47461  smfsupdmmbllem  47538  smfinfdmmbllem  47542