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Mar 11, 2017 at 21:59 answer added victoria timeline score: 0
Mar 11, 2017 at 21:58 vote accept user
Mar 11, 2017 at 21:54 comment added Donald Splutterwit Traditionally a subscript is indexing ( giving a list of variables $ a_1,a_2 , \cdots a_n$) and a superscript is for an exponent (to the power of ). In the paper cited they are using a superscript in an indexing fashion. If they had written $\xi_{i,m}$ it would have been less confusing.
Mar 11, 2017 at 21:53 history edited Bobson Dugnutt CC BY-SA 3.0
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Mar 11, 2017 at 21:51 answer added Bobson Dugnutt timeline score: 2
Mar 11, 2017 at 21:43 history asked user CC BY-SA 3.0