From: drhu...@gmail.com   
      
   On Saturday, 16 January 2021 at 12:12:59 UTC+11, drhu...@gmail.com wrote:   
   > y''-y' y-x=0   
   > y''-y' y-2x=0   
   > y''-y' y-3x=0   
   > ......   
   > y''-y' y -c x=0, where c is constant, 1,2,3, .....   
   > wolfram always give 2/(c1-x)   
   > y''-2y' y-x=0   
   > y''-2y' y-2x=0   
   > y''-2y' y-3x=0   
   > ......   
   > y''-2y' y -c x=0, where c is constant.   
   > wolfram always give 1/(c1-x)   
   > y''-b y' y-x=0   
   > y''-b y' y-2x=0   
   > y''-b y' y-3x=0   
   > ......   
   > y''-b y' y -c x=0, where b, c are constants.   
   > wolfram always give 2/(c1-x)/b   
   > Obviously all these solutions are wrong. How to check solution in wolfram?   
   >   
   > what is solution and how to check by your online software?   
   > Input your diff equation into mathHand.com, click the "dsolve" button to   
   solve, then click the "test" button to test solution.   
      
   more and more examples are in   
   http://drhuang.com/index/ode   
      
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