One problem with the concept of binary oppositions is that it seems to imply that Western philosophical thought is concerned only with two-valued quantities. For instance, a coin toss X is an event that may be represented as follows.
X = { H, T }.
Other two valued quantities :
X1 = {"good", "evil" }
X2 = {"on", "off" }
X3 = {"left", "right" }
Note that these are all the examples from the Wikipedia article on "binary opposition".
However, some variables can take three values.
Y = { +, - , 0 }
Y1 = {"good", "evil", "neither good nor evil"}
Y2 = {"on", "off", "neither on or off"}
Y3 = {"left", "right", "neither left nor right"}
You could have a N valued quantity for many different values of N. Here are two
examples of seven valued quantities.
Z1 = {"M", "T", "W", "R", "F", "S", "N" } --> for the days of the week
Z2 = {"black", "white", "American Indian", "Asian Indian", "Chinese", "Filipino", "Samoan"}
Western philosophical thought has ben concerned with seven valued quantities as well. As, for instance, in any analysis in which days of the week enters the picture. Also, some of the quantities that Western philosophical thought has considered have been continuous variables as well.
Speed of Zeno's arrow = {x | x >= 0 }
Velocity of Zeno's arrow = {x1 | -infinity < x < +infinity}
The problem of continuous quantities has not been considered by Jacques Derrida. Note that if the example of 'left' and 'right' given in the Wikipedia article on binary oppositions was intended to refer to political preferences, please note that individual political preferences may be considered multi-dimensional (some varying level of authoritarianism on one axis and another varying level of left-versus-right on another axis - as for example in PoliticalCompass.org's PoliticalCompass thing) and so the idea of 'left' and 'right' may be approximations too. The reason I am bringing this stuff up is that it is entirely unclear why Derrida manages to get so much attention when his theory leaves so much out.