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Can someone explain with only basic algebra? I tried reading the wiki but was a bit much.
Sometimes, you can reorient your problem such that a matrix or tensor has only diagonal entries, making it easier to handle.
For example by choosing new unit vectors or by changing the set of functions describing the problem (whatever is the thing that the matrix or tensor is tied to).
Thank god the universe is purely described using linear algebra.
Meanwhile EM people are using black magic design s-charts.
