This result is due to the quasi-linear utility function.
The shortcomings of the present paper primarily lie in two simplified assumptions: quasi-linear preference and the constancy of pollution emission rates.
The open diamonds will be used for whisper-like, quasi-pitched sounds.
The main point of this paper is to give an equivalent characterisation of quasi-simple valuations, as in the following theorem.
Similarly, the class of systems that have a recurrent state is a quasi-covariety that is not a covariety.
We must show that the square is a quasi-pullback.
Defining quasi-simple valuations as sups of directed families of simple valuations is important.
Using a quasi cover one can usually avoid quantification over powersets.
