發送短信 : Distribution solutions of some PDEs related to the wave equation and the diamond operator

 ______     ______   _____      ______  __    __  
|      \\  /_   _// |  __ \\   /_   _// \ \\ / // 
|  --  //   -| ||-  | |  \ ||   -| ||-   \ \/ //  
|  --  \\   _| ||_  | |__/ ||   _| ||_    \  //   
|______//  /_____// |_____//   /_____//    \//    
`------`   `-----`   -----`    `-----`      `