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Published online by Cambridge University Press: 20 November 2018
This paper generalizes the Aleksandrov problem: the Mazur-Ulam theorem on   $n-G$ -quasi normed spaces. It proves that a one-
 $n-G$ -quasi normed spaces. It proves that a one-  $n$ -distance preserving mapping is an
 $n$ -distance preserving mapping is an   $n$ -isometry if and only if it has the zero-
 $n$ -isometry if and only if it has the zero-  $n-G$ -quasi preserving property, and two kinds of
 $n-G$ -quasi preserving property, and two kinds of   $n$ -isometries on
 $n$ -isometries on   $n-G$ -quasi normed space are equivalent; we generalize the Benz theorem to
 $n-G$ -quasi normed space are equivalent; we generalize the Benz theorem to   $n$ -normed spaces with no restrictions on the dimension of spaces.
 $n$ -normed spaces with no restrictions on the dimension of spaces.