File talk:Занятие с кандидатом физико-математических наук.jpg
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[edit]Proof of what? This is the definition of a norm. 1234qwer1234qwer4 (talk) 15:13, 8 December 2019 (UTC)
Proof of what? This is the definition of a norm. 1234qwer1234qwer4 (talk) 15:13, 8 December 2019 (UTC)[reply]