12 Meaning of word changes.
13 The change occurs by substance of
word.
14 The change has trips.
15 The tips are starting point and
ending point.
16 Category theory may be helpful for
expression of change of word.
17 Scheme theory may be also helpful
for expression of change of word.
18 Cohomology may be helpful for
algebraic expression of the theories.
Tokyo
August 12, 2007