Theano (mathematician)
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Theano was one of the few women in ancient mathematics. Her father (an Orphic philosopher and physician) was a great supporter of Pythagoras. She was first a student of Pythagoras, later his wife. She took over the Pythagorean school after his death and was responsible for the concepts of the golden mean, golden ratio, and golden rectangle.
Natural philosopher (ancient Greece) She was the wife of Pythagoras and ran his school after his death. She is credited with writing the treatise on the Golden Mean -- (described in basic algebra textbooks). Theano not only worked in the areas of physics, medicine and child psychology, but was a great astronomer/mathematician in her own right. Her work on the theorem of the Golden Mean and the corresponding Golden Rectangle are considered to be her most important contributions. Her Life of Pythagoras is lost.
In the Greek school of philosophy run by Pythagoras there were many women who joined in as teachers and scholars. Those in his school lived in a communal manner and published all their writings under the name of Pythagoras. Today, then, it is difficult to determine who actually did which work, although some information has survived, such as that on Theano.