lemma
proved
tactic proof
floor_abs_intCast
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formal statement (Lean)
58lemma floor_abs_intCast (z : Int) : Int.floor (|((z : ℝ))|) = |z| := by
proof body
Tactic-mode proof.
59 have habs : |((z : ℝ))| = ((|z| : Int) : ℝ) := by
60 simp
61 rw [habs]
62 simpa using (Int.floor_intCast (R := ℝ) (z := |z|))
63