A logical function is given as F(A, B, C, D) = Σm (0, 4, 5, 10, 11, 13, 15). The number of Essential Prime Implicants in the given function will be _________.
@Mk Utkarsh so the number of EPI's are 2 right?
@Mk Utkarsh please tell me why or give any reference
See this question for reference
And you problem is not EPI or PI even in K-map you can't do this like diagonally.
EPI is also a prime implicant which have atleast 1 minterm covered by only one PI.
Every possible combination of minterms is PI.
In your case its is 6 PI and 2 EPI