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Benedict Irwin edited untitled.tex
over 9 years ago
Commit id: a65b9ef73fc608cf1fda91c34d809ffe2922193e
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index e52e35e..64eece7 100644
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If we define an operation that is $RCR_{ij}(A):=R_{ij}$, remove the $i^{th}$ column and the $j^{th}$ row of $A$, then this is expressible as
\begin{equation}
A^{-1}=\begin{bmatrix}
R_{11} |R_{11}| &
R_{12}J |R_{12}J| &
R_{13} |R_{13}| \\
R_{21}J |R_{21}J| &
R_{22} |R_{22}| &
R_{23}J |R_{23}J| \\
R_{31} |R_{31}| &
R_{32}J |R_{32}J| &
R_{33} |R_{33}|
\end{bmatrix}
\end{equation}
...
Clearly the condition for a right multiplication of the $J$ matrix being $i+j=odd$.
Alternatively
$A_{ij}^{-1}=R_{ij}J^{i+j-1}$ $A_{ij}^{-1}=|R_{ij}J^{(i+j-1)}|$