Week7 - ECON 117 Mathematical Economics Spring 2008 Week 7...

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ECON 117 Spring 2008 Mathematical Economics Week 7 3.4 The Properties of Determinant 1. = A A 2. If is obtained from by interchanging any two rows (or columns) of , then B A A = − B A Ex) 1 2 1 2 1 2 2 1 2 1 2 1 0 1 1 0 1 1 = = A B 3. If has two identical rows (or columns), then A 0 = A Ex) 1 2 1 1 2 1 0 1 1 = A Page 1 of 4
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