I just read on Wikipedia about elementary abelian groups which appear to be related to bit fields. I'd be grateful if someone could explain me this particular paragraph as I strive to fully master bit fields.
Elementary abelian groups
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The group
Z/2Z
is the set{0,1}
together with the binary operation+
that works as follows:In that paragraph, the author refers to the group
(Z/2Z)^n
, which is just an orderedn
-tuple of bits:where
b_i = 0
or1
, and the binary operation+
is taken coordinate-wise so thatwhere
b_i+d_i
is done as inZ/2Z
.The partial order denoted
<=
that is discussed is the usual order onZ/2Z
given byThe last two are reflexive. This order is extended to
(Z/2Z)^n
coordinatewise, so thatif and only if
For example, when n=2, we get the following relations:
Notice that
(1,0)
and(0,1)
are incomparable meaning that neither(0,1) <= (1,0)
nor(1,0) <= (0,1)
.