SOLUTION: I am having a hard time learning the rules of replacement. Can you help me solve this equation? 1) If I then S 2) If D, then not S The conclusion is not D or not I

Algebra ->  Conjunction -> SOLUTION: I am having a hard time learning the rules of replacement. Can you help me solve this equation? 1) If I then S 2) If D, then not S The conclusion is not D or not I       Log On

(1)    :  Given

(2)    : Given

(3)    :  Law of Excluded Middle

(4)     :  (2) Modus Tolens

(5)    : (2) Modus Tolens

(6)   : (3)  (4) or (5)