Just as Engels stated,“Just like the concept of number, the concept of form is obtained entirely from the outer world and is not generated out of pure thought in the mind. First, there must exist objects in definite forms and, after comparing these forms, the concept of form can be established. The subjects of pure mathematics are the space form and quantity relations of the actual world, and are therefore the very actual materials. ----But, to study these forms and relations in pure conditions, they must be separated from their own contents, which are to be put aside as things of no importance. By this, we can obtain points with no length, width and height and lines with no thickness and breadth, a and b, x and y, i.e., constant and variable. (Refer to [6]. Page 77)” Therefore, to say that space contains “geometric nature”----either flat or twisted----is to put individuality (peculiarity) into universality, i.e., universality is mistaken peculiarity.
(http://forrootbasic.51.net/wytk/xtwzh/xiahengguang/xhg-english/sogstreaer/sogstreaer.htm)
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