U is combination operations which includes union, cross product



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送交者: steven 于 2006-3-30, 11:15:16:

回答: Axiom 1 is not a complete sentence!! 由 gyro 于 2006-3-30, 08:36:06:

and etc, as long as it is not disjoint. YT is recursively ill defined. :) Btw, YT is short for YTer's Traffic, and L2 is a YTer, but he is not the only YTer. :)



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