I personally don’t want to emphasize lambda or at least lambda with beta substitution. I’m more interested in other binders like sum, max, integral, forall, exists. de Bruijn shifting doesn’t persay have to do with beta reduction, it can just be part of what happens in terms with binders and variables while you’re doing substitution in them. You need to do it while manipulating sum expressions also, not just lambda.
Summer 2019 I spent in New York City, while 2020 and 2021 I spent in Vienna. The graph shows the summer in NYC to reach higher temperatures，更多细节参见新收录的资料
Commission aims to tackle poverty in county。新收录的资料对此有专业解读
Ворончихина прокомментировала первое золото России на Паралимпиаде14:24。关于这个话题，新收录的资料提供了深入分析
МИД Китая описал отношения с Россией фразой «как скала»08:36