Keywords: Tatiana Ehrenfest cropped.jpg A photo of Russian-Dutch mathematician Tatyana Ehrenfest-Afanasyeva English Wikipedia en Image Tatiana Ehrenfest cropped jpg <br> http //www sil si edu/digitalcollections/hst/scientific-identity/CF/by_name_display_results cfm scientist Ehrenfest _Tatiana Portraits from the Dibner Library of the History of Science and Technology circa 1910 at the time the Ehrenfests moved to Leiden Author PD-old Mathematicians from Russia Ribbons Neckwear Black and white necklines Females with neutral background Black and white photographs of female faces Tatyana Afanasyeva |