@article {1805.06444, archivePrefix = {arXiv}, eprint = {1805.06444}, primaryClass = {math.OC}, author = {Matthias J. Ehrhardt and Erlend S. Riis and Torbjørn Ringholm and Carola-Bibiane Schönlieb}, title = {A geometric integration approach to smooth optimisation: Foundations of the discrete gradient method}, year = {2018}, url = {http://arxiv.org/abs/1805.06444} }