# Definition question

• Aug 24th 2013, 09:35 AM
philomath
Definition question
Hi, can somebody tell me the definition of : and,or

Thank you
• Aug 24th 2013, 10:42 AM
Plato
Re: Definition question
Quote:

Originally Posted by philomath
Hi, can somebody tell me the definition of : and,or
Thank you

Please post an exact question. As posted, that means absolutely nothing.
• Aug 24th 2013, 11:12 AM
HallsofIvy
Re: Definition question
Plato, I disagree. PhiloMath is clearly asking for definitions of the words "and" an "or". Since this is a "math help" forum, I presume he means their definitions as connectors in symbolic logic.

"And" is a connector such that the two statements P, Q are both true, then "P and Q" is true. Under any other conditions, "P and Q" is false.

"Or" is a connector such that if the two statements P, Q are both false, then "P or Q" is false. Under any other conditions, "P or Q" is true.
• Aug 24th 2013, 11:41 AM
Plato
Re: Definition question
Quote:

Originally Posted by HallsofIvy
Plato, I disagree. PhiloMath is clearly asking for definitions of the words "and" an "or". Since this is a "math help" forum, I presume he means their definitions as connectors in symbolic logic.

"And" is a connector such that the two statements P, Q are both true, then "P and Q" is true. Under any other conditions, "P and Q" is false.

"Or" is a connector such that if the two statements P, Q are both false, then "P or Q" is false. Under any other conditions, "P or Q" is true.

• Aug 24th 2013, 04:21 PM
HallsofIvy
Re: Definition question
Well, the colon set away from the end of the sentence puzzled me a bit and quotes would have helped.

'Hi, can somebody tell me the definition of: "and", "or".

Thank you'
it would have been easier to read.
• Sep 20th 2013, 07:35 PM
votan
Re: Definition question
AND and OR, usually capitalized, are Boolean logical operators. AND for association, OR for alternate.

Examples: you ask for a computer AND a printer, means you will not accept the one withour the other, a computer OR a printer means you will accept either one. Of course if you are given the other one for free you will be happy.

In programming, these operators are used in IF statement, or a logical statement. If the logical statement is satisfied, the program bypass the next statement to a referenced label.
• Jan 29th 2014, 02:44 AM
AnnyIngram
Re: Definition question
Hello,

"And" means to multiply the probabilities of each *separate* result required for a success.

"OR" means to add up the probabilities of each result that would be considered a success.
• Jan 29th 2014, 06:57 AM
HallsofIvy
Re: Definition question
THAT assumes that the question was about probability. And does not say anything about the definitions which was the question.
• Feb 10th 2014, 01:59 PM
Victoria1990
Re: Definition question
Boolean logical operators

Like HallsofIvy said:
"And" is a connector such that the two statements P, Q are both true, then "P and Q" is true. Under any other conditions, "P and Q" is false.

"Or" is a connector such that if the two statements P, Q are both false, then "P or Q" is false. Under any other conditions, "P or Q" is true.