On June 27

On this day in ... … 1831 , Marie-Sophie Germain (right), French mathematician best known for her work in number theory, died in Paris. (image credit ) Germain began teaching herself mathematics using her father's library when she was 13. Her parents felt that her interest was inappropriate and did all that they could to discourage her, though they relented in the face of her determination. Under the pseudonym M. LeBlanc, Sophie submitted a paper on analysis to Professor Joseph-Lo

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