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A fuzzy set A on R is ______ iff $A(\lambda x_1 + (1- \lambda)x_2) \geq min [A(x_1), A(x_2)]$ for all $x_1, x_2 \in R$ and all $\lambda \in [0,1]$ where minimum denotes the minimum operator.

  1. Support                                                                                                                                                                 
  2. $\alpha$ - cut
  3. Convex
  4. Concave
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