What do "$m$" and "$d$" mean in the formula $F(A,B,C,D) = \Sigma m(9,10,12) + d(3,5,6,7,11,13,14,15)$?

Question

What do "$m$" and "$d$" mean here?

I know that "$\Sigma$" means sum of products but I do not know what "$m$" and "$d$" mean.

Please help.

Not standard notation, so far as I am aware. Can you give more context? Where does the question come from? — saulspatz, Aug 11 '19 at 14:50
They look like functions of some kind. Without more information, we would only be guessing. — xxxxxxxxx, Aug 11 '19 at 14:50
@Abhirammv The d represents the don't care terms and m represents the min-terms which'll be in SOP form — 19aksh, Aug 11 '19 at 15:09

score 0 · Accepted Answer · answered Aug 11 '19 at 16:24

It's the notation that comes along with a Karnaugh Map in boolean algebras.

$\sum m$ represents the canonical disjunctive normal form (CDNF) or minterm canonical form.

The numbers - called minterms - are the entries in the table that are 1.

The $d$ is used to indicate the don't-care entries.

Additionally $\prod M$ represents the maxterm canonical form, which identifies the entries that are 0.

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