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import TestGame.Metadata
import Mathlib.Data.Set.Basic
import Mathlib.Algebra.Parity
import Mathlib.Tactic.Ring
Game "TestGame"
World "SetTheory"
Level 21
Title ""
Introduction
"
open Set
Statement
"" :
3 ∈ {n : ℕ | Odd n} := by
rw [mem_setOf]
use 1
ring
Tactics constructor intro rw assumption rcases simp tauto trivial
Lemmas Subset.antisymm_iff empty_subset