Abstract
Magnetism of nanographite is examined by consideration based on known rigorous theorems for the Hubbard model. For a bearded nanographite ribbon with the zigzag edge on one side and Klein's decorated edge on the other side, the surface magnetization of O(\\mu_B) per a carbon atom is exactly shown to appear for the π-electron system described by the Hubbard model. The surface magnetism appears due to existence of the edge states, which are degenerate localized states specific to these edges of nanographite. The same magnetic mechanism holds for network structures called the hypergraphite, when edges are prepared so that completely degenerate edge states appear.
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