It is a profound personal loss and a great loss for the entire scientific community. I last met Sayan in the summer of 2024, when I was giving a lecture at SIADS.AI in Leipzig. We spent evening discussing ways to advance the field of topological data analysis—both from theoretical and applied, software driven perspectives.Most notably, we explored possibilities for fostering more frequent collaboration between our groups, as well as with other researchers in Germany and Poland. This conversation was so characteristic of Sayan—full of ideas, energy, and genuine passion for bringing people together and pushing the boundaries of knowledge. I will deeply miss him, and I will always remember him.
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