Inverse
 Usage
• Inverse[m]给出一个方阵 m的逆。
Notes
• Inverse用在符号和数值矩阵。
• 对一个近似实数或复数矩阵，给定输入，产生的逆矩阵有最大可能的精度。 • Inverse[m, Modulus->n] 计算模 n的逆。 • Inverse[m, ZeroTest -> test] 计算 test[ m[[i, j]] ] 确定矩阵元素是否为零。缺省设置是 ZeroTest -> (#  0 &). • 也能给出Method 选项。可能的设置是关于LinearSolve的.
 Further Examples
The inverse of a 2 x 2 matrix displayed as a matrix.
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If the matrix is singular, the inverse is not computed.
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If the matrix is not square, the inverse is not computed.
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You can compute inverse of inexact matrices.
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Here is the inverse over the integers modulo 5.
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This checks the result.
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