Nambooripad order

In mathematics, Nambooripad order (also called Nambooripad`s partial order) is a certain natural partial order on a regular semigroup discovered by K S S Nambooripad in late seventies. Since the same partial order was also independently discovered by Robert E Hartwig, some authors refer to it as Hartwig–Nambooripad order. `Natural` here means......
Found on http://en.wikipedia.org/wiki/Nambooripad_order
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