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  • On a problem by Shapozenko on Johnson Graphs 

    Diego Gutiérrez, Victor; Serra Albó, Oriol (2018-09)
    Open Access
    The Johnson graph J(n, m) has the m-subsets of {1,2,…,n} as vertices and two subsets are adjacent in the graph if they share m-1 elements. Shapozenko asked about the isoperimetric function µn,m(k) of Johnson graphs, that ...