Junteng (Jason) Li
Junteng (Jason) Li
(Apologies… typing on my phone and hit the button that closed the issue by accident)
The intuition is that the additional w>=0 constraint changes the subgradient of abs(w) at w=0 from [-1, 1] to (-inf, 1]. This is by definition: the subgradient k of abs(w)...
My understanding is that the subgradient definition is for the (effective) domain of a function f, without the constraint that the domain is an open set. I understand that [Wikipedia](https://en.wikipedia.org/wiki/Subderivative)...