In this Paper, the speciality of geomagnetic field, geomagnetic factors, geomagnetic map and hypothesis of formation cause of geomagnetic field have been simply introduced.
本文简单介绍了地磁场的特点，地磁要素和地磁图以及地磁埸成因的几种假说。
With the use of the shrinked-map principle, we obtain a more general condition of the stability in cobweb model, where the usually cited linear hypothesis is canceled.
针对更一般的情形，利用压缩映象原理，给出了蛛网模型的稳定性条件，取消了通常的线性假设，同时提供了“蛛网”的一种简洁的几何描述。
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