發送短信 : Solution properties of some classes of operator equations in hilbert spaces

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