brualdi-ch6-21

open

difficulty 4

credited

Run this goal:./swarm/run.sh --goal brualdi-ch6-21

What it runs

The Lean statement the swarm must prove — kernel-verified at Gate A. The trailing sorry is the open obligation a proof replaces.

goals/brualdi-ch6-21.lean

import Mathlib

theorem brualdi_ch6_21 (n : ℕ) : Even (numDerangements n) ↔ Odd n := by
  sorry

No runs recorded for this suite yet — they appear here as the swarm attempts the benchmarks.