Fuzzy sets 41

0. Let A, B be fuzzy numbers, ∪m, ∩m denote standard fuzzy union and intersection respectively and, ∪a, ∩a denote algebraic sum fuzzy union and algebraic product fuzzy intersection. Which of the following is/are fuzzy numbers?
1. A, with standard complement
2. A ∩m B
3. A ∪m B
4. A ∪a B
5. A ∩a B

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