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

zero_ne_succ

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)

  89theorem zero_ne_succ (n : LogicNat) : zero ≠ succ n := by

proof body

Term-mode proof.

  90  intro h; cases h
  91
  92/-- **Peano P1, contrapositive**: every successor differs from zero. -/

used by (19)

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

depends on (4)

Lean names referenced from this declaration's body.