<commit_before>//  Copyright (c) 2014 <NAME>. All rights reserved.

public protocol Ring {
	class var additiveIdentity: Self { get }
	func + (Self, Self) -> Self
	
	class var multiplicativeIdentity: Self { get }
	func * (Self, Self) -> Self
}<commit_msg>Rings have a negation operator.<commit_after>//  Copyright (c) 2014 <NAME>. All rights reserved.

public protocol Ring {
	class var additiveIdentity: Self { get }
	func + (Self, Self) -> Self
	
	class var multiplicativeIdentity: Self { get }
	func * (Self, Self) -> Self
	
	@prefix func - (Self) -> Self
}
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