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Jul 28, 2014 at 23:38 comment added Francois Ziegler @AmirAsghari: I don't :-(
Jul 28, 2014 at 22:52 comment added Amir Asghari @FrancoisZiegler thanks a lot indeed. Do you know any English translation of his work?
Jul 28, 2014 at 22:08 comment added Francois Ziegler @AmirAsghari: See here and also there.
Jul 28, 2014 at 21:27 comment added Amir Asghari John, could you help me to find Huygens' writing on folium. I searched but I failed to find it. I am very curious since it is for a while that I am working on the development of negatives in the context of algebra for some educational reasons, and if your interpretation would be correct I need to revise the main part of the historical support of my thought.
Jul 28, 2014 at 5:59 comment added John Stillwell My interpretation of Huygens' drawing is that he is using negative coordinates, and using them algebraically, because he has to multiply negative coordinates in order to plot points outside the positive quadrant.
Jul 28, 2014 at 5:47 comment added Amir Asghari I was aware of that drawing, indeed through your work you have cited. My point is not just the acceptance of negative coordinates, rather it is when negative coordinates where algebraically used. Do you consider Huygens' drawing as an example of such a use?
Jul 28, 2014 at 1:27 history answered John Stillwell CC BY-SA 3.0