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Jun 18, 2016 at 2:09 comment added Christian Remling Any collection of more than one $X_j$ is linearly dependent according to this definition because (if $k=2$, say) we can take $\lambda_1 =1_A X_2$, $\lambda_2=-1_A X_1$.
Jun 17, 2016 at 5:10 comment added Fedor Petrov What are these $l$ lambda's?
Jun 16, 2016 at 23:34 history asked user74301 CC BY-SA 3.0