scholarly journals On the generation of prime implicants

1979 ◽  
Vol 2 (1) ◽  
pp. 167-186
Author(s):  
Bernd Reusch ◽  
Lothar Detering
Keyword(s):  
Boolean Functions ◽  
Normal Forms ◽  
General Theorem ◽  
General Representation ◽  
Prime Implicants

It is shown that various well-known normal forms for Boolean functions can be derived from a very general representation of subfunctions. Another general theorem on the relation between the prime implicants of a function and the prime implicants of its subfunctions is used to prove correct various methods of generating prime implicants.

scholarly journals Quality of Minimal Sets of Prime Implicants of Boolean Functions

2017 ◽  
Vol 63 (2) ◽  
pp. 165-169
Author(s):  
V. C. Prasad
Keyword(s):  
Power Consumption ◽  
Boolean Function ◽  
Boolean Functions ◽  
New Technique ◽  
Minimal Set ◽  
Reduce Power Consumption ◽  
Minimal Sets ◽  
Prime Implicants

Abstract Two new problems are posed and solved concerning minimal sets of prime implicants of Boolean functions. It is well known that the prime implicant set of a Boolean function should be minimal and have as few literals as possible. But it is not well known that min term repetitions should also be as few as possible to reduce power consumption. Determination of minimal sets of prime implicants is a well known problem. But nothing is known on the least number of (i) prime implicants (ii) literals and (iii) min term repetitions , any minimal set of prime implicants will have. These measures are useful to assess the quality of a minimal set. They are then extended to determine least number of prime implicants / implicates required to design a static hazard free circuit. The new technique tends to give smallest set of prime implicants for various objectives.

Boolean functions with long prime implicants

2013 ◽  
Vol 113 (19-21) ◽  
pp. 698-703 ◽  
Author(s):  
Ondřej Čepek ◽  
Petr Kučera ◽  
Stanislav Kuřík
Keyword(s):  
Boolean Functions ◽  
Prime Implicants

scholarly journals Composition of Post classes and normal forms of Boolean functions

2006 ◽  
Vol 306 (24) ◽  
pp. 3223-3243 ◽  
Author(s):  
Miguel Couceiro ◽  
Stephan Foldes ◽  
Erkko Lehtonen
Keyword(s):  
Boolean Functions ◽  
Normal Forms

scholarly journals Utilization of the Karnaugh Map in Exploring Cause-effect Relations Modeled by Partially-defined Boolean Functions

2021 ◽  
pp. 117-137
Author(s):  
Ali Muhammad Ali Rushdi ◽  
Raid Salih Badawi
Keyword(s):  
Boolean Functions ◽  
Qualitative Comparative Analysis ◽  
Systematic Investigation ◽  
Exact Matching ◽  
Minimal Set ◽  
Minimal Sets ◽  
Prime Implicants ◽  
Switching Functions ◽  
Programming Techniques ◽  
Karnaugh Map

This paper utilizes a modern regular and modular eight-variable Karnaugh map in a systematic investigation of cause-effect relationships modeled by partially-defined Boolean functions (PDBF) (known also as incompletely specified switching functions). First, we present a Karnaugh-map test that can decide whether a certain variable must be included in a set of supporting variables of the function, and, otherwise, might enforce the exclusion of this variable from such a set. This exclusion is attained via certain don’t-care assignments that ensure the equivalence of the Boolean quotient w.r.t. the variable, and that w.r.t. its complement, i.e., the exact matching of the half map representing the internal region of the variable, and the remaining half map representing the external region of the variable, in which case any of these two half maps replaces the original full map as a representation of the function. Such a variable exclusion might be continued w.r.t. other variables till a minimal set of supporting variables is reached. The paper addresses a dominantly-unspecified PDBF to obtain all its minimal sets of supporting variables without resort to integer programming techniques. For each of the minimal sets obtained, standard map methods for extracting prime implicants allow the construction of all irredundant disjunctive forms (IDFs). According to this scheme of first identifying a minimal set of supporting variables, we avoid the task of drawing prime-implicant loops on the initial eight-variable map, and postpone this task till the map is dramatically reduced in size. The procedure outlined herein has important ramifications for the newly-established discipline of Qualitative Comparative Analysis (QCA). These ramifications are not expected to be welcomed by the QCA community, since they clearly indicate that the too-often strong results claimed by QCA adherents need to be checked and scrutinized.

scholarly journals Using Variable-Entered Karnaugh Maps in Determining Dependent and Independent Sets of Boolean Functions

2012 ◽  
Vol 1 (2) ◽  
pp. 45-67
Author(s):  
Ali Muhammad Ali Rushdi and Hussain Mobarak Albarakati Ali Muhammad Ali Rushdi and Hussain Mobarak Albarakati
Keyword(s):  
Boolean Function ◽  
Boolean Functions ◽  
Independent Sets ◽  
Solution Procedure ◽  
Black Box ◽  
Important Class ◽  
Time Saving ◽  
Prime Implicants ◽  
Simultaneous Processing ◽  
Karnaugh Map

An important class for Boolean reasoning problems involves interdependence among the members of a set T of Boolean functions. Two notable problems among this class are (a) to establish whether a given subset of T is dependent, and (b) to produce economical representations for the complementary families of all dependent subsets and independent subsets of T. This paper solves these two problems via a powerful manual pictorial tool, namely, the variableentered Karnaugh map (VEKM). The VEKM is utilized in executing a Label-and-Eliminate procedure for producing certain prime implicants or consequents used in tackling the two aforementioned problems. The VEKM procedure is a time-saving short cut indeed, since it efficiently handles the three basic tasks demanded by the solution procedure, which are: (a) To combine several Boolean relations into a single one, (b) to compute conjunctive eliminants of a Boolean function, and (c) to derive the complete sum (CS) of a Boolean function. The VEKM procedure significantly reduces the complexities of these tasks by introducing useful shortcuts and allowing simultaneous processing. The VEKM procedure is described in detail, and then demonstrated via two illustrative examples, which previously had only black-box computer solutions as they were thought to be not amenable to manual solution. The first example deals with switching or bivalent functions while the second handles 'big' Boolean functions. Both examples indicate that the VEKM procedure proposed herein enjoys the merits of insightfulness, simplicity and efficiency

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