pith. machine review for the scientific record. sign in
def definition def or abbrev

phi

show as:
view Lean formalization →

No prose has been written for this declaration yet. The Lean source and graph data below render without it.

generate prose now

formal statement (Lean)

 117noncomputable def phi : ℝ := (1 + Real.sqrt 5) / 2

proof body

Definition body.

 118
 119/-- φ > 0. -/