On 07/24/2013 09:27 AM, Alan McKinnon wrote: > > I think it's the former. But I've been known to be wrong on things > (lately, more often than not...) > > Just looked on The Google, and there's no consensus I can find. Best > advice seems to be that union and difference are equal precedence so the > expression is evaluated left to right. > > Hence it's the former :-)
You can rewrite (A \\ B) as (A && !B), giving you one less case to worry about. But, some people (most notably, programming languages) assign a higher priority to intersection (&&) than they do to union (||). Of course, mathematically, they should probably have the same priority, so many people do the left-to-right thing. So in practice, you'd better use parentheses if you want anyone to know WTF you're talking about.
