DISCWORLD EQUATIONS

Shark thought processes largely represented by "=". [INTERESTING TIMES]
               you see it = you eat it
               one mistake = oblivion

The Librarian’s rendering of Big Al Onestone’s famous formula (which will halve your book sales)
               “Ook!”

Basic equation of polyfractal L-space:
               knowledge = power = energy = matter = mass

Pthagonal's investigation of the ratio of the circumference of a circle to its diameter:
               pie = 3.14 and lots of other figures, there’s no end to the buggers

You Bastard's Formula in complex analysis
               dz = ieiθ dθ = iz dθ