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Mathematics, 14.09.2019 04:10 Kiona3815

Answer the following true or false. justify your answer.
(a) if a is a subset of b, and x∈b, then x∈a.
(b) the set {(x, y) ∈ r2 | x > 0 and x < 0} is empty.
(c) if a and b are square matrices, then ab is also square.
(d) a and b are subsets of a set s, then a∩b and a∪b are also subsets of s.
(e) for a matrix a, we define a^2 = aa.

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