I am working in constraint optimization. And I've just come across this notation.
I'm not sure what this means.
The set I is the set of inequality constraints. I'm not sure what the function in brackets means
Mathematics Stack Exchange is a question and answer site for people studying math at any level and professionals in related fields. It only takes a minute to sign up.Sign up to join this community
I guess that $[y]^- = \min(y,0)$.
This notation is mentioned in Wikipedia, but with a slight difference: $[y]^- = -\min(y,0)$.
The important point is the minus sign as a superscript. The brackets are just like parentheses.