theorem S.is_threeven (s : S) : Threeven s.toNat := by
Author(s): Fiorella Cravero, Ignacio Ponzoni, Mónica F. Diaz, Gustavo E. Vazquez，更多细节参见钉钉
。关于这个话题，谷歌提供了深入分析
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} else if temp = 20 {
Online, subcultures have proliferated and mutated from yesterday’s IRC chats and listservs to today's Discords, subreddits and obscure corners of social media platforms — all with their own local vernacular. After all, people everywhere simply cannot stop creating inside jokes and memes, letting fly slips of the tongue and typos, and trying to make “fetch” happen. Meanwhile, the internet has also enabled a prolific flourishing of a rather new kind of human linguistic activity: the intentional creation of new linguistic diversity, on a grand scale, in the form of constructed languages, also known as “conlangs.”