This article describes a Lisp implementation of the Quine-McCluskey algoritm combined with the Petrick's method.
Please see the original article that describes the Quine-McCluskey algorithm. The Petrick's method was published as A Direct Determination of the Irredundant Forms of a Boolean Function from the Set of Prime Implicants. Bedford, Cambridge, MA, USA: Air Force Cambridge Research Center. AFCRC Technical Report TR-56-110. Unfortunately, I failed to find that report in the archives of the Defense Technical Information Center, apparently this document from 1956 was not digitised.
If you are not familiar with the subject, the best explanation among material that can be found online at no fee, in my opinion, are the slides from the 2003 CMUT329 by Dr. José Nelson Amaral, a professor in the CS Dept. at the University of Alberta, as well as the Handout #5 from 2016 CSEE E6861y by Dr. Steven Novick, a professor of Computer Science at Columbia University, I highly recommend both sources.
This implementation is intended for simplification of Boolean expressions in a formal language, not digital logic, hence it does not support don't care terms.
The distribution package is signed with my PGP key having the fingerprint of D853 E6A9 F0D1 E01C 4833 DF59 75F7 BBFB 009E 3949.
Simplification of A̅BC̅D̅ + AB̅C̅D̅ + AB̅CD̅ + AB̅CD + ABC̅D̅ + ABCD:
(QM:COMPUTE-TRUTH-TABLE '(A B C D)
'(OR (AND (NOT A) B (NOT C) (NOT D))
(AND A (NOT B) (NOT C) (NOT D))
(AND A (NOT B) C (NOT D))
(AND A (NOT B) C D)
(AND A B (NOT C) (NOT D))
(AND A B C D))
=> (4 8 10 11 12 15)
(QM:QUINE-MCCLUSKEY '(A B C D) '(4 8 10 11 12 15))
=> (OR (AND A C D) (AND A (NOT B) (NOT D)) (AND B (NOT C) (NOT D)))
Vadim Penzin, March 17^{th}, 2018
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