Author's reply to a discussion by Gengdong Cheng and Xiaofeng Liu of the review article "On symmetry and non-uniqueness in exact topology optimization" by George I. N. Rozvany (2011, Struct Multidisc Optim 43:297-317)
It is explained in this reply that the author fully agrees with the writers of the discussion, because findings of similar nature were introduced already in the original article. Further counter-examples demonstrating the range of validity of the author's propositions are also presented.
symmetry non-uniqueness skew-symmetry