Error in last line of linear algebra exercise
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mathijs-creemers-uh commented
It says Recalling that y = xtu, we can conclude that y = xtuu.
but it should be
recalling that y = alpha.u (and knowing that aplha = xtu) we can conclude that y = xtuu
yeefan commented
In the same exercise:
The question never said that u is a unit vector, but the solution "used the fact that u is a unit vector".