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Tech-Wonders.com » fuzzy-logic

Properties of Fuzzy Sets

Fuzzy sets are defined as sets that contain elements having varying degrees of membership values. Given A and B are two fuzzy sets, here are the main properties of those fuzzy sets:

Commutativity :-

  • (A ∪ B) = (B ∪ A)
  • (A ∩ B) = (B ∩ A)

Associativity :-

  • (A ∪ B) ∪ C = A ∪ (B ∪ C)
  • (A ∩ B) ∩ C = A ∩ (B ∩ C)

Distributivity :-

  • A ∪ (B ∩ C) = (A ∪ B) ∩ (A ∪ C)
  • A ∩ (B ∪ C) = (A ∩ B) ∪ (A ∩ C)

Idempotent :-

  • A ∪ A = A
  • A ∩ A = A

Identity :-

  • A ∪ Φ = A => A ∪ X = X
  • A ∩ Φ = Φ => A ∩ X = A

Note: (1) Universal Set ‘X’ has elements with unity membership value.
(2) Null Set ‘Φ’ has all elements with zero membership value.

Transitivity :-

  • If A ⊆ B, B ⊆ C, then A ⊆ C

Involution :-

  • (Ac)c = A

De morgan Property :-

  • (A ∪ B)c = Ac ∩ Bc
  • (A ∩ B)c = Ac ∪ Bc

Note: A ∪ Ac ≠ X ;  A ∩ Ac ≠ Φ

Since fuzzy sets can overlap “law of excluded middle” and “law of contradiction” does not hold good.

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