joshuamorton
searching PlanetScale…
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IIRC, you can grok this with linear transforms: given X = [[1,0],[0,0]] and Y = [[0,0],[0,1]], aXY = 0 for all a (because XY == [[0,0],[0,0]]). But, given V = [[1,1],[1,1]] (or, in fact, a lot of other matrices/linear transforms), XVT
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