"黑洞 作者:约翰-皮尔·卢米涅"
回答: 史瓦西时空 固有曲率。在二维面上的每一个点都可以量出两个相互垂直方向上的弯曲半径,二者乘积的倒数就是曲面的固有曲率。如果两个弯曲
由 marketreflections
于 2011-01-26 13:23:25
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