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您即将离开知乎,请注意您的帐号和财产安全。
https://books.google.com.ph/books?id=HRJYAhmD2n4C&pg=PR27&dq=la+theorie+des+equation+differentielle+polytechnique&hl=en&sa=X&ved=2ahUKEwi2_dzX8LbwAhUE6aQKHeAECpUQ6AEwAXoECAYQAg#v=onepage&q&f=false