Exact expanded PA statement
forall n. 1 <= n -> ~(n = 0)Structural proof guide
A natural at least one is nonzero.
Direct prerequisites: none. The authored body proceeds by case analysis (1), equality transport (2).
Proof neighborhood
Direct dependencies
none
Direct dependents
Formal native tactic body
Dependencies are hypotheses of this body receipt. The focused endpoint audits separately check the complete empty-context certificates.