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Theorem zxrd 46462
Description: An integer is an extended real number. (Contributed by Glauco Siliprandi, 2-Jan-2022.)
Hypothesis
Ref Expression
zxrd.1 (𝜑 → 𝐴 ∈ ℤ)
Assertion
Ref Expression
zxrd (𝜑 → 𝐴 ∈ ℝ*)

Proof of Theorem zxrd
StepHypRef Expression
1 zxrd.1 . . 3 (𝜑 → 𝐴 ∈ ℤ)
21zred 12803 . 2 (𝜑 → 𝐴 ∈ ℝ)
32rexrd 11359 1 (𝜑 → 𝐴 ∈ ℝ*)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   ∈ wcel 2145  ℝ*cxr 11342  ℤcz 12693
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-ext 2733
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3or 1104  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2100  df-clab 2740  df-cleq 2753  df-clel 2836  df-rab 3414  df-v 3453  df-dif 3902  df-un 3904  df-ss 3916  df-nul 4280  df-if 4483  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4868  df-br 5104  df-iota 6494  df-fv 6546  df-ov 7423  df-xr 11347  df-neg 11544  df-z 12694
This theorem is used by:  hoicvr  47557
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