What denotes the core(A) in a fuzzy set?

1.	What denotes the core(A) in a fuzzy set?
A.	{x\|ua(x)>0}
B.	{x\|ua(x)=1}
C.	{x\|ua(x)>=0.5}
D.	{x\|ua(x)>0.8}
Answer» C. {x\|ua(x)>=0.5}

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What denotes the core(A) in a fuzzy set?

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