A mnemonic used by students to remember the Maxwell relations (in thermodynamics) is " G ood P hysicists H ave S tudied U nder V ery F ine T eachers", which helps them remember the order of the variables in the square, in clockwise direction. Another mnemonic used here is " V alid F acts and T heoretical U nderstanding G enerate S olutions to H ard P roblems", which gives the letter in the normal left-to-right writing direction. Both times A has to be identified with F, another common symbol for Helmholtz free energy. To prevent the need for this switch the following mnemonic is also widely used:" G ood P hysicists H ave S tudied U nder V ery A mbitious T eachers"; another one is G ood P hysicists H ave SUVAT, in reference to the equations of motion. One other useful variation of the mnemonic when the symbol E is used for internal energy instead of U is the following: " S ome H ard P roblems G o T o F inish V ery E asy".