Andrea Bressan Massimiliano Martinelli Giancarlo Sangalli Overlapping subspaces and singular systems with application to Isogeometric Analysis. 2024 abs/2408.17273 CoRR https://doi.org/10.48550/arXiv.2408.17273 db/journals/corr/corr2408.html#abs-2408-17273 streams/journals/corr