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Abstract
In this paper, we have showed \(L^{4,\infty}\)-solutions to the cauchy problem
for the four-dimensional Navier-Stokes equations are smooth through backward
uniqueness and analytic functions properties .
The solutions of incompressible Navier-Stokes equations in four spatial dimensions are considered. We prove that the two-dimensional Hausdorff measure of the set of singular points at the first blow-up time is equal to zero.