The results of minimizing PDNF do not converge

[urugvai]

I have a function defined by a vector of values (2 3 4 6 7 12 15), from the truth table I compose the PDNF, I minimize it first by the Quine method, then by the Karnaugh map, the results differ by one term
I can’t understand what the error is

Spoiler

View attachment 9421View attachment 9422

Karnaugh map

 

[I like Serena]

I have a function defined by a vector of values (2 3 4 6 7 12 15), from the truth table I compose the PDNF, I minimize it first by the Quine method, then by the Karnaugh map, the results differ by one term
I can’t understand what the error is
Karnaugh map

Hi urugvai,

The second term from your application of the Quine method can be omitted without loss of coverage.
We can map it in the Karnaugh diagram and see that it is already covered by the first and third term of the Quine form.

 

[urugvai]

Hi urugvai,

The second term from your application of the Quine method can be omitted without loss of coverage.
We can map it in the Karnaugh diagram and see that it is already covered by the first and third term of the Quine form.

Thank you for saying that this is part of the norm.
As I understand it, the Quine method with four variables gives an abbreviated PDNF, and the Karnaugh diagram gives minimal?