But a proof is sometimes a fuzzy concept, subject to whim and personality.

Thus, many of the meanings which people ordinarily use to negotiate their way through life in reality turn out to be "fuzzy concepts".

The origin of fuzzy concepts is partly due to the fact that the human brain does not operate like a computer (see also Chinese room).

In translation work, fuzzy concepts are analyzed for the purpose of good translation.

Appraisers often use extreme examples to demonstrate fuzzy concepts.

A good example of a fuzzy concept is cool air - it has a clear meaning, but it is not black or white.

Happiness is a fuzzy concept and can mean many different things to many people.

The label smart city is still quite a fuzzy concept and is used in ways that are not always consistent.

Of course, that includes proprietary content, which remains something of a fuzzy concept among teenagers.