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What is a grammar?
For example, for the yesterday's diary,
it is ordinary language such as Japanese or English used to write it.
Ordinarily,
it is thought that the fact described by the yesterday's diary
is represented by which sentence permitted by the grammar
should be chosen
and it never is thought that the fact is represented by the grammar,
but in fact,
the fact described by the yesterday's diary
also has the feature that it is describable in Japanese or English.
This means that it may be describable neither in Japanese nor in English
if the fact was not so,
and here is a room for occurring of necessity to invent new grammars.
Then, what is a grammar in physics?
It is a coordinate system.
The core of the development of physics
to quantum mechanics from classical mechanics
is that the coordinate system was changed into Mq from Mc.
That is to say, it is a development of grammar.
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The content of this article was presented at APS+JPS 2006 Autumn Meeting.
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