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def definition def or abbrev

angleAt

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formal statement (Lean)

  38def angleAt (x y z : R3) : ℝ :=

proof body

Definition body.

  39  let u := dir x y
  40  let v := dir x z
  41  if (u = 0) ∨ (v = 0) then 0 else Real.arccos ((⟪u, v⟫_ℝ) / (‖u‖ * ‖v‖))
  42
  43/-! ## Kernel action and budget threshold -/
  44
  45/-- Kernel action as a function of the sensor angle `θ`. Domain of interest is `(0, π/2]`. -/

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depends on (17)

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