The usefulness of defining the boundaries of a concept

2021-10-23 - What you thought was one concept is two nested concepts and joined

• 2021-11-05 - It would also merge with the figure [Both “is X” and “is not X” are compatible.
  • In short, the area between these sets is the gray area.
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2019-01-26 - The usefulness of defining the boundary of the concept. - In the figure, two people are disputing the boundary of concept X. - They dispute whether the black circle case near the boundary is included in X. - Would that argument be useful?

• Suppose it is clear that the white circle is included in X
  • Even if the boundary of X is not clear, we can use the fact that the white circle is included in X
  • Isn’t over-quality trying to clarify the boundaries of X?

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