Describir: A brief course in analytic geometry :

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