//------------------------------//
// f(x) = exp(x) - x, (f^(-1))(x) = ? 
// Story: Princess Cadance (Mi Amore Cadenza) Is Actually a Lot Better at Differential Calculus (and Other Assorted Fairly Complex Topics in Mathematics) than Anyone Would Have Reasonably Expected 
// by Lazauya 
//------------------------------//

"Not much."
"Huh? What was that Starlight?"
"What? Oh, sorry, Spike, just thinking out loud."
"Oh," Spike said finally as the two stared out into the distance from their perch on the hill.