  We suggest a new formula, which allows the Schwarzschild's solution and the
Einstein radius to be applied to the dynamic universe, when our universe is
hypothetically regarded as a single dynamic black hole. In this study, a
cosmological constant problem is solved in the simplest manner, while we find
excellent agreements with observation. We adopt a model, wherein k = 0, lambda
is not equal to 0, and omega = 1 to interlock lambda with critical density of
the black hole of our universe rho cBH, thereby presenting complimentary
relation between lambda and Bekenstein-Hawking entropy S BH.
