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   _____     ___      _  __    ______    ____    
  / ___//   / _ \\   | |/ //  /_   _//  |  _ \\  
  \___ \\  / //\ \\  | ' //    -| ||-   | |_| || 
  /    // |  ___  || | . \\    _| ||_   | .  //  
 /____//  |_||  |_|| |_|\_\\  /_____//  |_|\_\\  
`-----`   `-`   `-`  `-` --`  `-----`   `-` --`

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Text this: Boundary value problem of the operator ⊕<sup>k</sup>related to the biharmonic operator and the diamond operator