What you thought was one concept is two nested concepts

https://gyazo.com/9e9180104e1cecccfaed3c2b1e92b294

We were talking about a concept, calling it A.

But it doesn't come across well.

After digging into why, I discovered that there are two concepts called A

Hereinafter referred to as A1 and A2.

in other words

A1 then A2

A2 but not necessarily A1

If you do not pay attention to this "A2 but not A1" event, or if it is very rare, A1 and A2 appear to be the same thing

As a result, one word, A, calls them both

This is a state where the boundary of the concept of A is blurred as shown in the lower left figure.

Humans can manipulate symbols without realizing that the boundaries are blurred concepts.

Often overlooked unless one is trained to clarify boundaries.

relevance

This is a lot about organization.

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