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Math Help - Logic

  1. #1
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    Logic

    I am very confused with logic, and the difference between, disjunctions and conjunctions, and where you would put perenthesis, and things like that. Does any one know a easy way to learn it, or can walk me through it.

    PLEASE HELP
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  2. #2
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    Re: Logic

    I think it would be helpful if you posted a specific question.
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  3. #3
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    Re: Logic

    how do you tell the difference between a disjunction, conjustion, negation, and a biconditional?
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  4. #4
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    Re: Logic

    how do you tell the difference between a disjunction, conjustion, negation, and a biconditional?
    There are couple of ways to look at this. The difference between conjunction and disjunction is similar to the difference between multiplication and addition. Both * and + are functions of two arguments, but they, obviously, in general return different results for the same arguments. While * and + can be considered as functions of natural numbers, conjunction /\ and disjunction \/ are functions that take and return 0 or 1. In fact, multiplication returns the same result as conjunction on {0, 1}.

    Also, you understand the difference between "and" (conjunction) and "or" (disjunction) in the natural language, don't you?

    Concerning parentheses, there is an order of operations for functions on {0, 1}, just as there is an order for functions on integers. The usual order is: negation, conjunction, disjunction, implication, biconditional.
    Last edited by Ackbeet; September 9th 2011 at 05:47 PM. Reason: First sentence no longer relevant.
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