pith. machine review for the scientific record. sign in
theorem proved term proof

phi_inv_pos

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)

 149theorem phi_inv_pos : 1/φ > 0 := by

proof body

Term-mode proof.

 150  have := phi_pos
 151  exact one_div_pos.mpr phi_pos
 152
 153/-- |1/φ| < 1, so the geometric series converges -/

used by (4)

From the project-wide theorem graph. These declarations reference this one in their body.

depends on (1)

Lean names referenced from this declaration's body.