Text this: On the operator ⊗BkRelated to the Bessel heat equation

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