Nadia had a question, but it was one she was pretty sure she couldn't ask in here. Instead, she waited silently and for Fox to move along. She wrote down the part about Arithmancers deciphering the numbers in magic to find counter-curses. Took notes about properties of numbers such as the 101, too.

She finally raised her hand, even though it was a homework question she thought she would be inventing rather than knowing when handing her homework and that wouldn't do. She asked, "Professor, the decay of a spell or to transform it to zero, how it is possible? Must we understand that a curse is a random number such as 7 and the counter curse -7, a negative number, so that the addition results in zero?

"And if so, how can we make a negative numbered spell?"