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In this paper, some counter examples to the conclusions of singular solution and envelope in two textbooks of ordinary differential equation are given.
“It will be included in people’s brains,” said Page. “When you think about something and don’t really know much about it, you will automatically get information.”

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Open the tool →奇解 (qí jiě) means “singular solution”.
奇解 is pronounced qí jiě in Mandarin Chinese.
“singular solution” is 奇解 (qí jiě) in Chinese.
This page has 2 example sentences using 奇解, each with pinyin and an English translation.