Karnaugh map extended to six or more variables

Inclusion of up to four minterms in each of the sixteen cells enables a Karnaugh map to be extended for the minimisation of six-variable logical functions. The columns of minterms of the map have been so designed as to alternate as even minterm and odd minterm columns. This distinctive separation of columns would facilitate the plotting of function minterms on the map as well as the generation of prime implicants. An example illustrates the application of the extended map in the easy minimisation of a six-variable function.