Comment:
Transformation from M
INIMUM
W
EIGHTED
S
ATISFIABILITY
.
Variation in which
for all
i
is NPO PB-complete and
not approximable within
for any
[
202
].
Variation in which there are at most
k
non-zero entries on each
row of the matrix with
k
constant is approximable within
k
[
147
] and [
171
].