*Its All about Pj Problem Strings -
7 Spaces Of Interest and their associated Basic Sequences; 7 Pj Problems of Interest (PPI) and their Alleles (A)*

The Universe is a *Multi-Matter Multi-Dynamic Space*. The matter that constitute it are in a *mass-energy equivalence* state and so possess the capacity to do *work* (realized action of force).

This *equivalence* is sumarized by the *Eistein Equation, E = mc ^{2}* (E is energy, m is mass and c is the velocity of light) and can be broadly grouped as follows:

(a) *Mass-energy equivalence* that move with velocities less than the velocity of light.

(b) *Mass-energy equivalence* that moves with the velocity of light.

The *energy* associated with (b) is called *radiant energy*. A *mass-energy equivalence* at rest has *potential energy* (P.E) and *kinetic energy (K.E) during motion. K.E = (1/2)mv ^{2}* in the case of (a). K.E = electromagnetic radiation in the case of (b). The conversion of P.E to K.E or from K.E to P.E, is one of the most common energy conversions.

All other forms of energies are different expressions of P.E or K.E.

The matter that constitute energy; the residence of the matter; and the matter's velocity are all expressions of Pj Problems. Consequently, energy is an expression of Pj Problems