原点对称
symmetric about the origin A set (e.g., domain) is symmetric about the origin if whenever $x$ is in the set, $-x$ is also in the set.
CSCA 数学 考试术语
symmetric about the origin A set (e.g., domain) is symmetric about the origin if whenever $x$ is in the set, $-x$ is also in the set.
CSCA 数学 考试术语