Some sufficient and necessary conditions of the full symmetric real matrix is full definite matrix are discussed.

讨论了全对称实矩阵是全正定矩阵的几个充分必要条件。

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In this paper the concept of the full definite matrix is given, some sufficient and necessary conditions of the full symmetric real matrix is full definite matrix are discussed.

本文给出了全正定矩阵的概念，讨论了全对称实矩阵是全正定矩阵的几个充分必要条件。

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Last year, NASA smacked a spent Centaur rocket into a Shadowed lunar crater and blew out the first definite signs that the moon is chock-full of water.

去年，美国航空航天局利用服役到期的半人马座火箭撞击一个阴影区的月球陨坑，轰出第一个明确的迹象-月球内部充满了水。

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