ECON 117 Spring 2008 Mathematical Economics Week 7 3.4The Properties of Determinant 1. ′=AA2. If is obtained from by interchanging any two rows (or columns) of , then BAA= −BAEx)121212212 121 011011⎡⎤⎡⎤⎢⎥⎢⎥==⎢⎥⎢⎥⎢⎥⎢⎥⎣⎦⎣⎦AB3. If has two identical rows (or columns), then A0=AEx)121121 011⎡⎤⎢⎥=⎢⎥⎢⎥⎣⎦APage 1 of 4
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