Publisher Correction to: Mathematical Programming https://doi.org/10.1007/s10107-023-01936-6

During the proof correction stage, the production team removed the sub captions by mistake in Fig. 2a and 2b. The correct figures are given below.

Fig. 2
figure 1

Continuous and discrete subgradient trajectories in magenta and yellow respectively

Now, The original article has been corrected, and the publishers apologise for this error.