Database
REAL AND COMPLEX NUMBERS
Elementary integer functions
The floor and ceiling functions
reflcl
Next ⟩
fllelt
Metamath Proof Explorer
Ascii
Structured
Theorem
reflcl
Description:
The floor (greatest integer) function is real.
(Contributed by
NM
, 15-Jul-2008)
Ref
Expression
Assertion
reflcl
⊢
(
𝐴
∈ ℝ → ( ⌊ ‘
𝐴
) ∈ ℝ )
Proof
Step
Hyp
Ref
Expression
1
flcl
⊢
(
𝐴
∈ ℝ → ( ⌊ ‘
𝐴
) ∈ ℤ )
2
1
zred
⊢
(
𝐴
∈ ℝ → ( ⌊ ‘
𝐴
) ∈ ℝ )