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Dauphin is offline Dauphin
Emperor
Caught in a tuna net
Jan 1970
time: 05:37
  Old Post 26-06-2004 15:35
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#1 Report this post to a moderator
A question about search Support Apolyton, buy Civilization: The Boardgame

I notice the options:

Search for items including these words:
and excluding these words:
and optionally containing these words:
search for exact phrase:


What purpose does the third option serve? It appears a little redundant. I think it has a function - the OR function is what I think its supposed to be but the wording is confusing.
MarkG is offline MarkG
Grand Lord of Apolyton, Owner of all this land as far as the eye can see

Donate to the Red Cross		 Macedonia, Greece
Jan 1970
time: 07:37
  Old Post 27-06-2004 12:50 Visit MarkG<br><img src=/forums/images/admin-icon.gif>'s homepage!
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if the first option is A and the third is B, if you use both you'll have the following expresion

(A and B) or (A)
Ljube is offline Ljube
Emperor
Belgrade
May 2003
time: 06:37
  Old Post 27-06-2004 14:48
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quote:
 Originally posted by MarkG
if the first option is A and the third is B, if you use both you'll have the following expresion

(A and B) or (A)


Which is logically equivalent to A.


The proof:

Assume A is true. Then (A and B) or (A) is true.
Assume A is false. Then (A and B) is false, hence (A and B) or (A) is false.
Assume B is true/false - no bearing on the logical value of the expression (A and B) or (A).
DrSpike is offline DrSpike
Deity
Enthusiastic member of Apolyton
Sep 2001
time: 05:37
  Old Post 27-06-2004 14:56
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Just how bored were you when you noticed this BC?

MarkG is offline MarkG
Grand Lord of Apolyton, Owner of all this land as far as the eye can see

Donate to the Red Cross		 Macedonia, Greece
Jan 1970
time: 07:37
  Old Post 27-06-2004 15:39 Visit MarkG<br><img src=/forums/images/admin-icon.gif>'s homepage!
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quote:
 Originally posted by Ljube-ljcvetko
Which is logically equivalent to A.

The proof:

Assume A is true. Then (A and B) or (A) is true.
Assume A is false. Then (A and B) is false, hence (A and B) or (A) is false.
Assume B is true/false - no bearing on the logical value of the expression (A and B) or (A).
perhaps , but you also get results with the B text highlighted

Dauphin is offline Dauphin
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Caught in a tuna net
Jan 1970
time: 05:37
  Old Post 01-07-2004 16:05
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#6 Report this post to a moderator
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Ok that makes some sense. You get to highlight options without filtering negative results.
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