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Find inverse using Gaussian elimination (#681)
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Find inverse using Gaussian elimination (#681)
Augment
[
A
∣
I
]
[A|I]
[
A
∣
I
]
and row‑reduce to
[
I
∣
A
−
1
]
[I|A^{-1}]
[
I
∣
A
−
1
]
.
