Beables/Observables in Classical and Quantum Gravity

Understand

Observables 'are observed' whereas beables just 'are'.

• This gives beables more scope in the cosmological and quantum domains.
• Both observables and beables are entities that form 'brackets' with 'the constraints' that are 'equal to' zero.
• We explain how depending on circumstances, these could be, e.g., Poisson, Dirac, commutator, histories, Schouten-Nijenhuis, double or Nambu brackets, first-class, gauge, linear or effective constraints, and strong, weak or weak-effective equalities.