Newsletter #67-2021 16 participants from 25 countries represented. The event was planned to be held in Vienna, Austria, where University of Technology would have been kind enough to serve as hosts. However, it was decided two months before the event, that it had to be organized as virtual event due to the impact of the delta variant. We thank our Austrian friends and contributors for their hard work that was unfortunately not made visible due to this decision, which we all regret. A new symposium of TC15 will be organized in Madeira during ECF23 and hopefully ESIAM23 will be again an in presence event. (http://www.ecf23.eu/TC15_symposium.pdf) Filippo Berto
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