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Results tagged with matrix-inverse
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user 6040
For questions about inverses and pseudoinverses of matrices.
27
votes
Should the formula for the inverse of a 2x2 matrix be obvious?
I remember the inverse by looking at the corresponding linear fractional transformation. It sends $\frac{-d}{c}$ to $\infty$ and $\infty$ to $\frac{a}{c}$, so the inverse had better reverse this; it f …
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