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**Wheeler-De Witt equation ....**

Could we construct using dirac,s method a wheeler -De witt equation to first order in derivatives and including the time?..in fact it would be easy just propose an equation like this

(A0d/dt+A1d/dx+...+A3d/dz)F=0

where obviously A0**2=0 (Grassman num ber) why has nobody tried to do so?..in fact this new equation could solve the problem of time in quantum gravity.