Abstract ( 19.0: how to describe "brief")
Recall the spirit of quantum language ( i.e., the spirit of the quantum mechanical world view), that is,
Thus, we consider that
even the "belief" should be described in terms of quantum language.
it suffices to consider the identification:
"odds by bookmaker"
every phenomenon should be described by quantum language
knowing it is somewhat unreasonable
|$(\sharp):$||S. Ishikawa, Mathematical Foundations of Measurement Theory, Keio University Press Inc. 2006.|
Again recall that, as mentioned in $\S$1.1, the main purpose of this book is to assert the following figure 1.1: