Symbolic space determinations on physical limitations

In the quest for the determination of the physical limitations imposed on computing (Bledsoe, 1961; Bremermann, 1962; Ligomenides, 1967, 1968; Keyes and Landauer, 1970; Keyes, 1975), unless we introduce basic considerations relating to such things as the computing philosophy and methodology employed, the encoding and translation languages, and techniques, and the question of computability and intractability, our investigation limits itself to pursuit of outer bounds on energy, time, and spacing requirements for the transfer storage and processing of two-state signal quanta, rather than dealing with bounds on processing information which is specially encoded for computation. It seems that limitations imposed in the symbolic space precede by several orders of magnitude those in the energy space.