Equation

Equations were a part of mathematics.

After spending Christmas with his grandmother and aunt in 2004, Matiu worked on time travel equations and sent himself to Christmas Eve, 1953, the time when his grandfather disappeared. (PROSE: Water's Edge)

The Skasis Paradigm was the mathematical equation behind the way the universe worked. (TV: School Reunion)

The Hausanthropic equations defined the evolution of aesthetically-pleasing lesser species. The form of the tardigrade was implied in the equations. (PROSE: The Short Briefing Sergeant's Tale)