Abstract
A method for finding out the prime implicants and hence the minimal sum(s) of switching functions containing essential prime implicants, cyclic type prime implicants or functions with don't care terms has been suggested in this paper. This paper describes a simpler procedure for sorting out the EPIs while forming the combination tables and to select the other essential terms needed for the minimal cover of the function by a new technique known as the “Formation of combination chain” decribed in the method. The method thus does away with the need for the successive PI tables as suggested in Q-M method.
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