Akkalarapangna, Christine Ladd (1847-1930) ni runtu matame gelar program Ph.D. mancaji "C. Ladd"; Christine " Kitty" Ladd napurai persyaratang gelarna ri 1882, naekiyya riwerengngi penghargaan ri taung 1926, puranna karir yae malampe aljabar logika (ita tabel sitongenna), pakkitang warnae, nenniya psikologi.