The phrase "a fuzzy concept" is correct and usable in written English.
It can be used to describe an idea or notion that is vague, unclear, or not well-defined.
Example: "The notion of happiness is often considered a fuzzy concept, as it varies greatly from person to person."
Alternatives: "an ambiguous idea" or "a vague notion."
He goes on to explain how Sanskrit scholars understood aesthetics, choosing ancient texts which, he says, describe "resonance"—a fuzzy concept involving feelings reverberating with soul and emotional bonding, which can change with different readers and different readings.
But a proof is sometimes a fuzzy concept, subject to whim and personality.
A good example of a fuzzy concept is cool air -- it has a clear meaning, but it is not black or white.
Experts on the Russian legal system say ownership can be a fuzzy concept in Russia, where significant assets are rarely bought or sold in an entirely straightforward way.
The idea "that such a fuzzy concept should be captured in the measurement of national output is absurd," Mr Letwin says.Government statisticians insist that everything will be transparent.
"But the only road map Putin laid out today was a fuzzy concept of a grand coalition to fight terrorism arm in arm with Bashar al-Assad, the very man the Americans say is the source of the problem".
In parallel, Jacques Monod and many others emphasized the role of chance, a fairly fuzzy concept (see below a mathematical definition of randomness in strings of symbols), as essential to account for a large proportion of the unexpected properties of life (Monod, 1971).
Volume, although a rather fuzzy concept, is rather effective as a filter between conformers dissimilar in shape and features [7].
He wrote: That everyone understands objectivity differently makes it a dangerously fuzzy concept, easy road kill in the rush to new journalistic techniques.
For each set of concepts (A subseteq M, prod _{m in A}m) represents conjunction of the concepts in A; for instance, (A={m_{1}, m_{5}} subseteq M, prod _{m in A}m=m_{1}m_{5}) represents a new fuzzy concept "attribute 1 is good and attribute 5 is good".
Genetic variation is a very broad, fuzzy concept that may refer to very different scales within an individual, population or species.
