Normalized ground state solutions of the biharmonic Schrodinger equation with general mass supercritical nonlinearities

We are interested in the following problem {Delta(2)u+lambda u=g(u) in R-N, integral R-N|u|(2)dx=c, where N >= 5, c>0 and lambda is an element of R appears as a Lagrange multiplier. When g(u) satisfies a class of general mass supercritical conditions, we introduce one more constraint and consider the corresponding infimum. After showing that the new constraint is natural and verifying the compactness of the minimizing sequence, we obtain the existence of normalized ground state solutions. In this sense, the existing results are generalized and improved significantly.