Chisholm, Grace. Algebraic Group Theoretical Studies on Spherical Trigonometry. 1895. Scarce. Submitted in 1895 at the University of Göttingen, this dissertation marks the first doctorate awarded to a woman in any discipline by a German university. At a time when Prussian institutions largely excluded women from formal academic candidacy, Grace Chisholm crossed national boundaries from England to pursue advanced mathematical study under Felix Klein, a leading architect of modern geometry. Her research applied group-theoretical methods, then at the forefront of mathematical innovation, to spherical trigonometry, aligning with the Klein school's effort to unify algebra and geometry. The work stands at a pivotal moment in both the professionalization of mathematics and the gradual opening of European higher education to women. Chisholm, Grace. Algebraic Group Theoretical Studies on Spherical Trigonometry. Göttingen: University of Göttingen, 1895. Doctoral dissertation in German. Soft covers; 73 pages with mathematical figures and diagrams. Outer wrapper absent; green spine reinforcement visible. Minor edge wear and toning consistent with age. Chisholm later collaborated extensively with William Henry Young in analysis and measure theory, while also publishing independent work such as On Infinite Derivatives (1915), which earned the Gamble Prize in Mathematics. Her career illustrates both intellectual accomplishment and structural barriers faced by women mathematicians at the turn of the twentieth century, positioning this dissertation as a foundational document in the history of women in science. Overall very good condition. Scarce. Only two copies held in American institutions, as per OCLC Worldcat.