Text this: Spreading resistance calculations by the variational method

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