Minimal Projections onto Subspaces with Codimension 2
Filip Sokołowski · Numerical Functional Analysis and Optimization · 2016
In this article, the relationship between absolute projection constants with dimension n and with codimension n is given. In particular, bounds from below are found for absolute projection constants with codimension 2. Also, exact formulas for minimal projections in this case are given. It is shown that these minimal projections are not unique.