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Putnam 1951 B1

  • Session B
  1. Find the condition that the functions M(x,y)M(x, y) and N(x,y)N(x, y) must satisfy in order that the differential equation Mdx+Ndy=0M d x+N d y=0 shall have an integrating factor of the form f(xy)f(x y). You may assume that MM and NN have continuous partial derivatives of all orders.

Dataset text PutnamGAP. Quoted with source.

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