http://groups.yahoo.com/group/curves_surfaces/ curves and surfaces Fri, 15 Feb 2008 10:14:18 GMT xah lee http://groups.yahoo.com/group/curves_surfaces/message/84 http://groups.yahoo.com/group/curves_surfaces/message/84 lots update in the past 2 months. About 20 GeoGebra files are added. See: http://xahlee.org/SpecialPlaneCurves_dir/Intro_dir/whatsNew.html Xah xah@... Thu, 11 Jan 2007 18:10:14 GMT Chris Young http://groups.yahoo.com/group/curves_surfaces/message/83 http://groups.yahoo.com/group/curves_surfaces/message/83 Here, I've added the draggable complex point q through which there's a unique equiangular spiral going through (1, 0) and with "collapsed radius" of 1. By Thu, 19 Oct 2006 19:18:36 GMT Chris Young http://groups.yahoo.com/group/curves_surfaces/message/82 http://groups.yahoo.com/group/curves_surfaces/message/82 Here, I've just used the unit normal vector to thicken the border of the main triangle to distinguish it from the sub-triangles (thinner, colored borders). Wed, 18 Oct 2006 01:25:39 GMT Chris Young http://groups.yahoo.com/group/curves_surfaces/message/81 http://groups.yahoo.com/group/curves_surfaces/message/81 I'm not exactly sure why this is working, but I've finally got overlapping stripes to show how the positive area (in this case, the yellow triangle outside Tue, 17 Oct 2006 17:18:41 GMT Chris Young http://groups.yahoo.com/group/curves_surfaces/message/80 http://groups.yahoo.com/group/curves_surfaces/message/80 Thought you might be interested in this as an example of illustrating algebraic geometry with Graphing Calculator. Free GC viewers are available at Fri, 28 Jul 2006 19:38:09 GMT melihturgut_deu http://groups.yahoo.com/group/curves_surfaces/message/79 http://groups.yahoo.com/group/curves_surfaces/message/79 Hi, everyone Im new within you. I m a MSc student. I m researching Spherical Indicators in Lorentzian Space. Could you have some files abaout it? Sun, 02 Apr 2006 16:26:56 GMT saad amin http://groups.yahoo.com/group/curves_surfaces/message/76 http://groups.yahoo.com/group/curves_surfaces/message/76 Assslam io alikum Sir, Actually i am doing project RF RANGE FINDER which will calculate the location and direction of FM radio station only within certain Sun, 02 Apr 2006 16:26:25 GMT Saad Amin http://groups.yahoo.com/group/curves_surfaces/message/75 http://groups.yahoo.com/group/curves_surfaces/message/75 Sir, Actually i am doing project RF RANGE FINDER which will calculate the location and direction of FM radio station only within certain range u can say if Wed, 26 Oct 2005 23:00:39 GMT Roger Bagula http://groups.yahoo.com/group/curves_surfaces/message/68 http://groups.yahoo.com/group/curves_surfaces/message/68 ... The symmetrical version : x=x1/(Sqrt[2]+y1) y=x2/(Sqrt[2]+y2) z=x3/(Sqrt[2]+y3) is very pretty. Roger L. Bagula { email: rlbagula@... or Wed, 26 Oct 2005 04:07:29 GMT Narasimham Gudipaty http://groups.yahoo.com/group/curves_surfaces/message/67 http://groups.yahoo.com/group/curves_surfaces/message/67 Interesting. Any special properties?(chirality etc.) Seems to be a self-intersecting surface. PlotPoints->{41,21} increased surface smoothness of g1 and g2. Tue, 25 Oct 2005 21:26:50 GMT Roger Bagula http://groups.yahoo.com/group/curves_surfaces/message/66 http://groups.yahoo.com/group/curves_surfaces/message/66 A new Clifford torus type surface using a six cordinate triaxial model: ( Mathematica Notebook) x1 = Cos[t]; x2 = Cos[t + 2*Pi/3]; x3 = Cos[t - 2*Pi/3]; y1 = Mon, 24 Oct 2005 18:28:00 GMT Roger L. Bagula http://groups.yahoo.com/group/curves_surfaces/message/65 http://groups.yahoo.com/group/curves_surfaces/message/65 Dear glnarasimham, Just joined egroup here. Could you repond to my email at: rlbagulatftn@... with your current email address. Roger Mon, 12 Sep 2005 15:58:33 GMT glnarasimham http://groups.yahoo.com/group/curves_surfaces/message/64 http://groups.yahoo.com/group/curves_surfaces/message/64 The natural equation of a given curve is curvature = f(s). Find the natural equation of an offset curve distant + / - p from it. p is parallel distance and s Thu, 01 Sep 2005 23:21:46 GMT Narasimham Gudipaty http://groups.yahoo.com/group/curves_surfaces/message/63 http://groups.yahoo.com/group/curves_surfaces/message/63 Continuation of the last reply ... Mathematica code if it helps : a=5 ; b=3 ; ParametricPlot3D[ {x,(b+t)*(1-x/(a-t)),0}, {x,0,16},{t,-8,8}, PlotPoints-> Thu, 01 Sep 2005 03:07:57 GMT Narasimham Gudipaty http://groups.yahoo.com/group/curves_surfaces/message/62 http://groups.yahoo.com/group/curves_surfaces/message/62 At one instant let the x,y intercepts be (a,b).The constant sum of ix,y, intercepts is a+ b = c ; It is a parabola passing through (a+b,0), (0,a+b) tangential