Geodesic
New example of a variety of lie algebras with fractional exponent
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 6 (2011), pp. 44-47

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In the case of characteristic zero, the variety generated by a simple infinite-dimensional Lie algebra of Cartan type $W_2$ has a fractional exponent. 
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     author = {S. S. Mishchenko},
     title = {New example of a variety of lie algebras with fractional exponent},
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     year = {2011},
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     url = {http://geodesic.mathdoc.fr/item/VMUMM_2011_6_a9/}
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S. S. Mishchenko. New example of a variety of lie algebras with fractional exponent. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 6 (2011), pp. 44-47. http://geodesic.mathdoc.fr/item/VMUMM_2011_6_a9/