Hi again Derek, Here are some more detailed ideas for your thesis prospectus. Feel free to "recycle" any of this that you find useful. First, I don't think it's reasonable to focus on just one of the construction problems, since they have often been treated as a "package" and their various solutions are closely related on several levels. We will want to treat all three of the most famous construction problems: (1) "squaring the circle": Construct a square with the same area as a given circle (2) "duplicating the cube": Construct a cube with volume twice that of a given cube (3) "trisecting a general angle": Construct an angle exactly 1/3 a given angle (the construction should work for any given angle, not just special ones like right angles) T.L. Heath (a very famous British historian of Greek mathematics from the end of the 19th and the beginning of the 20th century) says "It is evident that the Greek geometers came very early to the conclusion that the three problems in question ... required for their solution either higher curves than circles or constructions more mechanical in character than the use of the ruler and compasses in the sense of Euclid's Postulates 1 - 3". ([3], p. 219) In other words, they weren't able to solve these using just straightedge and compass constructions in a very restricted sense, but they developed methods for solving these using other given curves, or more general constructions that involve taking what we would call limits ("neusis constructions" or "verging constructions"). Eventually all three construction problems were proved to be unsolvable using just straightedge and compass, but only in the 19th century, and then using ideas from field theory (a branch of abstract algebra). The connection between the algebra and the geometry comes, of course, from Descartes' ideas of introducing coordinates to describe locations of points in the plane (something the Greeks did not do). I think a great thesis would be to (a) Investigate the Greeks' ideas about methodology of geometric constructions. They were the really the first to consider questions of this sort: How you solve particular types of problems and what methods are allowed? Main Question: Where did this train of thought come from? Can we trace the history? (b) Study and present (in modern language and in your own words) some of these neusis or "mechanical" constructions, especially the use of the "quadratrix" curve of Hippias and the spirals of Archimedes to square the circle, the neusis construction of Nicomedes for trisection problem, and the cissoid of Diocles for the duplication of the cube. (One interesting side-angle here is that all of these can be presented very effectively using the geometry construction/visualization software packages like GeoGebra or Geometer's Sketchpad that are often used in secondary math education now.) Main Question: Is Heath's statement quoted above really justified? Or was it just that they did not know how to derive solutions with simpler methods and "settled" for any solution they could find? Can we find evidence in the original sources? (c) Learn and present the ideas in field theory that led to the eventual proof of impossibility of the three constructions using only the strict straight-edge and compass constructions. Some first sources we will want to consult -- not in any particular order (and not alphabetized, either!) [1] Knorr, R.W. The Ancient Tradition of Geometric Problems, Dover reprint, 2012. He views the Greek geometric enterprise almost like a modern mathematical research program and argues that the construction problems were a motivating force for the whole development of Greek geometry. Is that a valid comparison? Is he being anachronistic? [2a] Eves, H. An Introduction to the History of Mathematics, 5th ed., Saunders, 1983. [2b] Boyer, C. and Mertzbach, U. A History of Mathematics, 3rd ed., Wiley, 2011. (Both for general background and overview only -- we'll see that their discussions of this topic are somewhat superficial.) [3] Heath, Sir T.L. A History of Greek Mathematics, vols. 1 and 2, Dover reprint, 1981. This has never really been superseded as an overview of the surviving Greek texts. Chapter VII is an indispensable summary of the Greek efforts to solve the three construction problems. [4] Heath, Sir T.L., ed. The Works of Archimedes, Dover reprint, 2002. [5] Klein, J. Greek Mathematical Thought and the Origin of Algebra, Dover reprint, 1992. For background on the geometry-algebra connection. [6] Proclus, A Commentary on the First Book of Euclid's Elements, translated by G. Morrow, 2nd ed., Princeton University Press, 1992. Proclus lived about 700 years after the time of Euclid, but his commentary is one of the main surviving texts that discuss how the Greeks thought about their mathematics. &&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&& J Delattre and R Bkouche, Why ruler and compass?, in History of Mathematics : History of Problems (Paris, 1997), 89-113.