Artificial Intelligence - Fuzzy Sets

Let A be a generalized bell-shaped fuzzy number such that

and B = (b1, b2, b3) be a triangular fuzzy number.
State whether the following is TRUE or FALSE

Let A, B, C, D are closed intervals of R. Let A ⊆ C and B D, then state whether the following are TRUE or FALSE?

97. A + B ⊆ C + D

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Let A, B, C, D are closed intervals of R. Let A ⊆ C and B D, then state whether the following are TRUE or FALSE?

98. A - B ⊆ C - D

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Let A, B, C, D are closed intervals of R. Let A ⊆ C and B D, then state whether the following are TRUE or FALSE?

99. A . B ⊆ C . D

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Let A, B, C, D are closed intervals of R. Let A ⊆ C and B D, then state whether the following are TRUE or FALSE?

100. A / B ⊆ C / D

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