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   _____     ___               _    _     ______  
  / ___//   / _ \\    ____    | || | ||  /_   _// 
  \___ \\  / //\ \\  |    \\  | || | ||    | ||   
  /    // |  ___  || | [] ||  | \\_/ ||   _| ||   
 /____//  |_||  |_|| |  __//   \____//   /__//    
`-----`   `-`   `-`  |_|`-`     `---`    `--`     
                     `-`

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發送短信 : Common fixed points for single-valued and multi-valued mappings in G-metric spaces