Subnet

[mathematics] In topology and related areas of mathematics, a subnet is a generalization of the concept of subsequence to the case of nets. The definition is not completely straightforward, but is designed to allow as many theorems about subsequences to generalize to nets as possible. If (xα) and (yβ) are nets from directed sets A and B r...
Found on http://en.wikipedia.org/wiki/Subnet_(mathematics)
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