3 votes

Exchanging the sum and the min in double sum

There are really only two cases to consider, for linear functions $f(x)$: If $f(x) = 0$ is constant, clearly its minimum is $0$; If $f(x)$ is not the zero constant function, then its minimum does not ...
  • 46.8k
1 vote

Reference for convex optimization

Sorry, such a reference doesn't exist, because the result isn't true. The method you're describing is known as "coordinate descent". In the Wikipedia page, there is an example showing how ...
  • 45.2k

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