- One of the significance of school subjects is giving instruction of such fictions (logical systems) as have been surviving in human history by the reason of their usefulness.
- Each school subject, such as mathematics, geography, biology, language, history, music, and so on, is a grouping of fictions.
- A fiction is made as a tool, and refined to become better as a tool.
- It is not accidental, but programed, that a fiction has a usage.
- It is not a caprice which creates a fiction.
A fiction which a caprice creates must be an abstract nonsense.
- A fiction survives by reason of its usefulness.
A fiction which is not useful is just disposed.
Conversely, the presence of a fiction implies that it is currently useful.
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