Formulas
- Periodic travelling wave
- Percolation critical exponents
- Permutation automaton
- Permutation graph
- Phase margin
- Raman spectroscopy
- Ramsey-Turán theory
- Representative layer theory
- Reversible computing
- Revision theory
- Velocity potential
- Wiener–Hopf method
- Shear velocity
- Safe and Sophie Germain primes
- Shift graph