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

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發送短信 : Coupled coincidence point theorems for a (β, g)-ψ-contractive mapping in partially ordered g-metric spaces