From: Linus Torvalds <torvalds@osdl.org>
Date: Sat, 01 Jul 2006 03:59:54 GMT
Subject: Re: A note on merging conflicts..
Message-ID: <Pine.LNX.4.64.0606302054580.12404@g5.osdl.org>
In-Reply-To: <Pine.LNX.4.64.0606302046230.12404@g5.osdl.org>



On Fri, 30 Jun 2006, Linus Torvalds wrote:
>
> (it's not strictly a valid set operation, but it approaches being an 
> "xor" instead of a union or an intersection or a difference).

Oh, I guess it _is_ perfectly valid. It's called a "symmetric difference" 
in set theory.

So from a set standpoint:

	Git op:			Set theory:

	git-rev-list a..b	// difference: B - A
	git-rev-list b..a	// difference: A - B

	git-rev-list a b	// union of A B (order doesn't matter)

	git-rev-list a...b	// symmetric difference A B (order doesn't matter)

	git-rev-list $(git-merge-base --all a b)
				// intersection of A and B

I think.

		Linus