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Originally posted by rainmaker
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Originally posted by Dan_ref
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Originally posted by Smitty
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Originally posted by ChuckElias
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Originally posted by rainmaker
JR -- In strict logic rules, the word "or" doesn't mean both, it means one only is good enough. "If you have a red coat, or green boots, you may enter the building" means that both people with red coat but no green boots, and people with no red coat but green boots will be in there.
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Not that it's all that relevant to the overall discussion, but in formal logic, "or" means "at least one" which implies "possibly both". So in your example Juulie, people with a red coat and green boots would also be admitted.
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Formally, you are correct, but for efficiency's sake, any process put in place to analyze an OR situation would only look for one of the various options. In other words, as soon as you see the red coat, there's no need to look for green boots. He's in.
I'm a software engineer....I can't help myself. The geek in me just comes out. 
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Actually what Juulie is describing is an *exclusive* or: A or B is true but not both A & B are true.
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No, I'm not.
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Well yes, you are:
"If you have a red coat, or green boots, you may enter the building" means that both people with red coat but no green boots, and people with no red coat but green boots will be in there.
You've excluded people with red coats and green boots from your party - A (red coats) or B (green coats) is true but both A and B is not true.
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And btw, what's Dan doing in San Jose?!?
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Staying warm.
But now I'm back here in Siberia with a free weekend thanks to the snow which we're all promised.
BTW, what JR is saying (I think) is formally called NOT A or B. IOO, if neither a pass or a shot occurs we have a held ball. Which is quite different form what (I think) you are saying, which is a held ball occurs if either a pass is prevented or a shot is prevented.
In practice I am happier with myself if I do not call a held ball when a defender's hand is on the ball but a pass is made (NOT A or B)
[Edited by Dan_ref on Jan 22nd, 2005 at 12:33 PM]