Describir: Computability and unsolvability

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