Einstein equation
1.THE COSMOLOGICAL SOLUTIONS OF THE EINSTEIN-YANG EQUATION AND THE EINSTEIN EQUATION
2.INTEGRABILITY PROPERTY AND GEOMETRIC INTERPRETATION OF CYLINDRICAL EINSTEIN-EQUATION
5.THE EXACT SOLUTION TO EINSTEIN EQUATION IN CONFORMAL SPHERICAL SYMMETRIC ELECTROMAGNETIC VACUUM
7.It is suggested that the Stokes-Einstein equation might not be adequate for describing the kinetic process in crystal nucleation of Li_2O·2SiO_2 glass in great undercooling state.

