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The topological classification of a series of frustration-induced spin-gapphases in the spin-1/2 ferromagnetic--antiferromagnetic alternating Heisenbergchain with next-nearest-neighbour interaction reported in J. Phys. Soc. Jpn.82, 064703 (2013) is confirmed using two kinds of entanglement spectra definedby different divisions of the whole chain. For the numerical calculation, theiDMRG method is used. The results are consistent with the valence bond solidpicture proposed in the previous paper.

Characterization of Topological Phases of Spin-1/2 Frustrated Ferromagnetic-Antiferromagnetic Alternating Heisenberg Chains by Entanglement Spectrum