Eulerian uniqueness of the α-SQG patch problem
arxiv(2024)
摘要
We consider the patch problem of the α-SQG equation with α=0
being the 2D Euler and α= 1/2 the SQG equations respectively. In
the Eulerian setting, we prove the uniqueness of patch solutions of regularity
W^2, 1/1-2α + when 0<α< 1/2 and C^1,
4α+ when 0<α< 1/4. The proof is intrinsic to the
modified Biot-Savart law and independent of the local existence of patch
solutions.
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