Additive Atoms: 10828 von Beckwith, David, NCCU Problems Group

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Subspaces of the Vector Space of 2-by-2 Matrices: 10813 von Richman, Fred, NCCU Problems Group

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The Distance between the Endpoints of a Longest Path: 10811 von Tracy, Phil, NCCU Problems Group

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Complex Roots of a Polynomial: 10688 von Tomescu, Ioan, Lau, Kee-Wai, Lossers, O. P., Andersen, K. F., Chapman, R. J., Ciaurri, O., Fernandez, E., De Angelis, V., Deutsch, E., Will, G., Falkowitz, M., Franco, Z., Georghiou, C., Lewandowski, J., Nijenhuis, A., Norfolk, T. S., Stenger, A., GCHQ Problems Group, NCCU Problems Group, WMC Problems Group

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