This paper proposes a re-definition of field classification based on hierarchical levels K₀--K₄. The framework is presented as a provisional and incomplete starting point, rather than a fixed taxonomy. Each field may require different depths of hierarchy, and cross-level or cross-domain connections are not restricted. The purpose of this work is not to finalize a universal classification, but to open a structure through which specialists in each domain can reconsider and reorganize their own field. Any disagreement with the proposed allocation is welcome; if a field naturally crosses levels or connects to others, such movements should be accepted rather than suppressed. This study aims to initiate discussion, not to close it.
Masaru Morimoto (Tue,) studied this question.