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The Originator of Cobweb Diagrams

According to Alessandro Rosa, ``An episodic history of the staircased iteration diagram", ANTIQUITATES MATHEMATICAE Vol. 15(1) 2021, p. 3–90, doi: 10.14708/am.v15i1.7056, a version of the diagram ...
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How did Gaussian and Eisenstein integers get their names?

In the 19th century, the Gaussian integers were just called "complex integers". In Dirichlet-Dedekind's Vorlesungen uber Zahlentheorie from the late 1800s, the XI-th supplement was the 1st ...
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