卡诺群中有限周长集的可求长性:切超平面的存在性
Rectifiability of sets of finite perimeter in Carnot groups: existence of a tangent hyperplane
摘要:
我们考虑卡诺群中的局部有限周长集。证明了若E是卡诺群G中的一个局部有限周长集,则对G中几乎每一个关于E的周长测度的x,E在x处的某个切线是垂直半空间.这是Franchi-Serapioni-Serra Cassano在第2步卡诺群中的一个定理的部分推广:他们证明了,对于几乎每个x,E在x处有唯一的切线,并且这个切线是一个垂直半空间。
英文摘要:
We consider sets of locally finite perimeter in Carnot groups. We show that if E is a set of locally finite perimeter in a Carnot group G, then for almost every x in G with respect to the perimeter measure of E, some tangent of E at x is a vertical halfspace. This is a partial extension of a theorem of Franchi-Serapioni-Serra Cassano in step 2 Carnot groups: they have shown that, for almost every x, E has a unique tangent at x, and this tangent is a vertical halfspace.
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