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Testing the Validity of Arguments

  1. Jun 13, 2010 #1
    Boolean Algebra:

    Everyone will now about the situation once Jay starts gossiping. Leon is upset because everyone knows about the situation. Since Leon is upset, May is unhappy. Therefore, May is unhappy when Jay starts gossiping.


    I attached my working and I said it was invalid as line 15 was false. However, the argument is vaild. I have done this thrice and I still get line 15 false. Perhaps there is something in my working?
     

    Attached Files:

    Last edited: Jun 14, 2010
  2. jcsd
  3. Jun 14, 2010 #2
    "Everyone will now about the situation once Jay starts gossiping"

    "Jay starts gossiping" suppose to be the antecede,

    same goes for others, you interpret it incorrectly, if i'm not wrong
     
    Last edited: Jun 14, 2010
  4. Jun 15, 2010 #3
    I swapped them all around and I still got an invalid argument....I wrote it on paper this time and it was the second line. I am in my throes of pain here.

    Situation -> S
    Jay -> J
    May -> M
    Leon -> L

    (I didn't put the statements here, but you know what I mean)

    J->S
    S->L
    M->L
    -----
    J->M


    Is this right?
     
  5. Jun 15, 2010 #4
    you change it correctly except

    "Since Leon is upset, May is unhappy."

    any word after "since" should be the antecede.

    try it again, it should be right
     
  6. Jun 15, 2010 #5
    Thank you, I got it right this time.
     
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