We have studied various classical solutions in R2 cosmology. Especially we
have obtained general classical solutions in pure R2\ cosmology. Even in the
quantum theory, we can solve the Wheeler-DeWitt equation in pure R2\
cosmology exactly. Comparing these classical and quantum solutions in R2\
cosmology, we have studied the problem of time in general relativity.Comment: 17 pages, latex, no figure, one reference is correcte