J. Group Theory 19, No. 2, (2016), 249-322.
Abstract:
In [5] an extension construction of (n+1)-dimensional dual hyperovals using n-dimensional bilinear dual hyperovals was introduced. Related to this construction, is a construction of APN functions in dimension n+1 using two APN functions in dimension n. In this paper we show, that the isomorphism problem for the (n+1)-dimensional extensions can be reduced to the isomorphism problem of the initial n-dimensional objects. The automorphism problem can be reduced in an analogous way.
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