2026-01-21T16:00:33Z https://njump.me Chris Purcell https://njump.me/npub1j5p92fvccv5kmennj6524v3t2lnu0pevvk5nm33wn265ky7dcr3q9dvu8m https://media.mathstodon.xyz/accounts/avatars/000/020/793/original/88e3744fbbc1a514.jpeg https://media.mathstodon.xyz/accounts/avatars/000/020/793/original/88e3744fbbc1a514.jpeg https://njump.me/nevent1qqsxle9phd9y0nft9hsk57s5kyq8crnyxdxewh36r9vf8hchathslmgzyz2sy4f9nrpjjm0xwwt2324j9dt703u893j6j0wx96dt2jcnehqwyaw7vqv What are some examples of non-trivial finite sequences, whose definition could be understood by a child? I&#39;ll leave the definition of non-trivial vague, but as an example &#34;positive integers less than 10&#34; is trivial. <br/><br/>I mentioned that there are infinitely many prime numbers to the 7yo (he had heard that 67 is prime), and he said that that was obvious since there are infinitely many numbers. I think a good non-example would help here. I don&#39;t mind if the proof is too difficult.<br/><br/>#math 2026-01-21T11:18:11Z https://njump.me/nevent1qqsgavgf5800szlu4jz2n39fvrpxvkf734r9ncn4354epysh70w869gzyz2sy4f9nrpjjm0xwwt2324j9dt703u893j6j0wx96dt2jcnehqwyava5dd In reply to <a href='/nevent1qqsfrk90fuc7csrnutf39twldtyxegjpz3fljr6gpm5kcpqx2thpkxspz4mhxue69uhhyetvv9ujumt0wd68ytnsw43q3jl9ur'>nevent1q…l9ur</a><br/>_________________________<br/><br/><span itemprop="mentions" itemscope itemtype="https://schema.org/Person"><a itemprop="url" href="/nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpqknzsux7p6lzwzdedp3m8c3c92z0swzc0xyy5glvse58txj5e9ztqaufa4k" class="bg-lavender dark:prose:text-neutral-50 dark:text-neutral-50 dark:bg-garnet px-1"><span>nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpqknzsux7p6lzwzdedp3m8c3c92z0swzc0xyy5glvse58txj5e9ztqaufa4k</span> (<span class="italic">nprofile…fa4k</span>)</a></span> it&#39;s an extreme case, and macabre, but the Warsaw Ghetto Hunger Study comes to mind. I hope (and believe) conditions in America will not get that bad, but it&#39;s an example of hunkering down for sure. They also managed to overcome a typhus epidemic, which is rather topical. The wikipedia page has references, but I haven&#39;t read them to be honest. 2025-03-20T10:03:29Z