phc/lean4game - lean4game - Gitea - PHC

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-												add NNG

											
										
										
											2 years ago
+								import NNG.Metadata
 								import NNG.MyNat.Addition
 								import Std.Tactic.RCases
 								import Mathlib.Tactic.LeftRight
 								Game "NNG"
 								World "AdvProposition"
 								Level 7
 								Title ""
 								open MyNat
 								Introduction
 								"
 								"
 								Statement or_symm
 								""
 								    (P Q : Prop) : P ∨ Q → Q ∨ P := by
 								  intro h
 								  rcases h with p | q
 								  right
 								  exact p
 								  left
 								  exact q
 								Conclusion
 								"
 								"