Abstract

The Cauchy problems for Navier–Stokes equations and nonlinear heat equations are studied in modulation spaces M q , σ s ( R n ) . Though the case of the derivative index s = 0 has been treated in our previous work, the case s ≠ 0 is also treated in this paper. Our aim is to reveal the conditions of s, q and σ of M q , σ s ( R n ) for the existence of local and global solutions for initial data u 0 ∈ M q , σ s ( R n ) .

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