Allan's jaw dropped as he read what River had written on the board. He stepped forward and ran his finger along the progression of the equations and slowly began to get more and more excited.
Reaching the end, Allan wrote several more numbers and letters while River grinned and nodded.
With a whoop, Alan scooped River into his arms and spun her around, “You did it!”
River shook her head and smiled, “You did it. I just helped...”
-- Quest - Chapter 17 by Briglad