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lean4game/server/testgame/TestGame/Levels/SetTheory/L20_UnionInter.lean

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import TestGame.Metadata
import Mathlib.Data.Set.Basic
import Mathlib.Algebra.Parity
import Mathlib
Game "TestGame"
World "SetTheory2"
Level 7
Title ""
Introduction
"
Wir haben bereits `` und `∩` kennengelernt. Von beiden gibt es auch eine Version für Familien
von Mengen: $\\bigcup_i A_ i$ und $\\bigcap_j B_ j$.
"
open Set
Statement
"" : True := sorry
NewTactics constructor intro rw assumption rcases simp tauto trivial
NewLemmas Subset.antisymm_iff empty_subset