\input zb-basic \input zb-ioport \iteman{io-port 06076529} \itemau{Tim\'ar, \'Ad\'am} \itemti{Approximating Cayley diagrams versus Cayley graphs.} \itemso{Comb. Probab. Comput. 21, No. 4, 635-641 (2012).} \itemab Summary: We construct a sequence of finite graphs that weakly converge to a Cayley graph, but there is no labelling of the edges that would converge to the corresponding Cayley diagram. A similar construction is used to give graph sequences that converge to the same limit, and such that a Hamiltonian cycle in one of them has a limit that is not approximable by any subgraph of the other. We give an example where this holds, but convergence is meant in a stronger sense. This is related to whether having a Hamiltonian cycle is a testable graph property. \itemrv{~} \itemcc{} \itemut{Hamiltonian cycle; graph sequences} \itemli{doi:10.1017/S0963548311000733} \end