Talk:Partial inverse of a matrix

Broken source, small math mistake

Point 1: reference Seems to be broken, it leads to a 404.

Point 2: the given case for ${a_{kk}}$

$\left[\operatorname {inv} _{k}(A)\right]_{ij}={\begin{cases}{\frac {1}{a_{kk}}}&i=j=k\\-{\frac {a_{kj}}{a_{kk}}}&i=k,j\neq k\\{\frac {a_{jk}}{a_{kk}}}&i\neq k,j=k\\a_{ij}-{\frac {a_{ik}a_{kj}}{a_{kk}}}&i\neq k,j\neq k\end{cases}}$

seems to have a typo for case $i\neq k,j=k$, it should be ${\frac {a_{ik}}{a_{kk}}}$.

Plnts (talk) 18:40, 14 July 2022 (UTC)