Dyad
Dyads extend Vectors to provide an alternative description to second RankTensors. A dyad 
of a pair of Vectors 
and 
isdefined by 
. The Dot Product is defined by
and the Colon Product by
References
Morse, P. M. and Feshbach, H. ``Dyadics and Other Vector Operators.'' §1.6 in Methods of Theoretical Physics, Part I. New York: McGraw-Hill, pp. 54-92, 1953.
- Points Problem
- Pointwise Dimension
- Poisson Bracket
- Poisson-Charlier Function
- Poisson-Charlier Polynomial
- Poisson Distribution
- Poisson Integral
- Poisson Integral Representation
- Poisson Kernel
- Poisson Manifold
- Poisson's Bessel Function Formula
- Poisson's Equation
- Poisson's Harmonic Function Formula
- Poisson Sum Formula
- Poisson Trials
- Poke Move
- Poker
- Polar
- Polar Angle
- Polar Circle
- Polar Coordinates
- Polarity
- Polar Line
- Pole
- Pole (Geometry)