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The Yangian of the Lie algebra sl_n is known to have different presentations,in particular the RTT realisation and the Drinfel'd realisation. Using theisomorphism between them, the explicit expressions of the comultiplication, theantipode and the counit in the Drinfel'd realisation of the Yangian Y(sl_n) aregiven. As examples, the cases of Y(sl_2) and Y(sl_3) are worked out.Comment: 14 page

Hopf structure of the Yangian Y(sln) in the Drinfel’d realization