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Ponderous math problems and indecipherable texts are far from most people’s minds during the hot months of summer vacation. But class is still in session at the Anne C. Fisher Gallery: “Summer School” features works by Martha Oatway and Carl Lennartson, who draw their inspiration from a 19th-century hydrology textbook and James Joyce’s Finnegan’s Wake, respectively. Oatway incorporates bits of equations, drawings of spines and brains, and earthen colors to create a sense of proportion and balance; Lennartson’s paintings take an abstract book and run with its themes, offering a sideways outline of the Nile and a “tattered” painting of a Greek flag. Neither artist displays a da Vinci–esque grasp on math and art, but they do manage to make even the most cumbersome quadratic equations pleasing to the eye. The exhibition is on view from noon to 3 p.m. Tuesday and noon to 6 p.m. Friday and Saturday, to Friday, Sept. 8, at the Anne C. Fisher Gallery, 1054 31st St. NW. Free. (202) 625-7555. (Kim Rinehimer)