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Is there a special name for morphisms sharing some special condition?

代数几何 Math StackExchange 0 票 0 回答 44 浏览 提问者: tpd 2026-08-06 18:07
number-theory algebraic-geometry reference-request terminology arithmetic-geometry

问题内容

Let $\Phi=[F_1,\ldots,F_N]$ be a map, with $F_i$ homogenous polynomials of variables $X_1,\ldots,X_N$ of the same degree with integer coefficients.

The map $\Phi$ mapping $Z^N$ into itself may share the following property:

Let $P=(x_1,\ldots,x_N)\in Z^N$ be any point such that $\gcd (x_1,\ldots,x_N)=1$, then $\gcd$ of all coordinates of $\Phi(P)$ equals $1$ as well.

For example $\Phi=[X_1^2,2X_1X_2-X_2^2]$ satisfies this property.

Has this property been studied or even more is there a name for it?

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