Artificial Intelligence - Fuzzy Sets

6. Let R, S be fuzzy relation on X. Suppose R is reflexive then which of the following is/are reflexive
1. R ∪m S
2. R ∪a S
3. R ∪b S
4. R ∪d S

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7. Let R(x, y) = e-|x-y| be a fuzzy relation on R X R. Which of the following is/are CORRECT?
1. R is reflexive, symmetric but not transitive with respect to max-product composition
2. R is reflexive, symmetric but not transitive with respect to max-min composition
3. R is an equivalence relation with respect to max-min composition
4. R is an equivalence relation with respect to max-product composition

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8. Let R = be a fuzzy relation on X × X. Suppose RT is the transitive closure with max-min composition and max union and R'T is the transtitive closure with max-product composition and max union.

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9. Let R be a fuzzy relation on X. Which of the following is/are TRUE?
1. If R is transitive w.r.t. max-min composition, then a-cuts of R are crisp transitive relations.
2. If R is transitive w.r.t. max-product composition, then a-cuts of R are crisp transitive relations.
3. If R is symmetric then its a-cuts are also symmetric.
4. If R is transitive w.r.t. max-min composition, then R is transitive w.r.t. max-product composition.

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10. Let R = be a fuzzy relation on X = {x1,x2,...,x5}. Which of the following is/are CORRECT?
1. R is equivalence relation w.r.t. max-min composition
2. R is not transitive w.r.t. max-min composition
3. For a=0.1, [x1] = {x1,x2,x3,x4,x5} is the equivalence class.
4. For a=0.7, [x1] = {x1,x3,x4} and [x2]={x4,x5} are the equivalence classes

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