conjugate
(also denoted z) is equal to x−yi. As a point in the complex plane 
represents the mirror image of z in the real axis. The complex conjugate satisfies,
and so complex conjugation is a field automorphism of ℂ. Other identities include
It is an important fact that if the complex number α is a root of a polynomial equation
where a1,…, an are real, then 
is also a root of this equation.
- primitive polynomial
- primitive root
- Prim's algorithm
- principal axes
- principal axes
- principal ideal
- principal ideal domain
- principal moments of inertia
- principal part
- principal value
- principal value integral
- principle of conservation of energy
- principle of conservation of linear momentum
- principle of mathematical induction
- principle of moments
- principle of the excluded middle
- prior distribution
- prior probability
- prism
- prisoner's dilemma
- private key crytography
- probability
- probability density function
- probability generating function
- probability mass function