correction: in the article "on projection methods, convergence and robust formulations in topology optimization" (struct multidisc optim 43:767–784, 2011), there are typos regarding the minimal length scale in the intermediate design. the labels of the longitudinal axis in figs. 12, 20 and 21 were mistyped. the corrected labels are b/r, bs/r and bv/r, respectively. on page 780, all the ratios b/2r should be b/r. additionally, b=0.092l should be corrected to b=0.046l. publisher's note springer nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.correction: in the article "on projection methods, convergence and robust formulations in topology optimization" (struct multidisc optim 43:767–784, 2011), there are typos regarding the minimal length scale in the intermediate design. the labels of the longitudinal axis in figs. 12, 20 and 21 were mistyped. the corrected labels are b/r, bs/r and bv/r, respectively. on page 780, all the ratios b/2r should be b/r. additionally, b=0.092l should be corrected to b=0.046l. publisher's note springer nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.