Describir: Fundamental theory of structures

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