recently i started a mailing lists on Python and Java programing. I started it about a month ago, in which i give daily tips or commentary about them as i...
... I want to learn some orbital mechanics and electrodynamics. So I'm interested in vector fields. Don't have a text handy but IIRC there are level surfaces;...
hi Hop, you might find this wikipedia article useful: http://en.wikipedia.org/wiki/Vector_calculus Xah xah@... http://xahlee.org/PageTwo_dir/more.html ...
here are 3 curves illustrating 3 cusps (at t=0) that has different curvatures. {t^2, t^3} {t^2, t^5} {t^2 + t^3, t^4} first case has curvature Infinity. Second...
new page on cusps, with illustrations: http://xahlee.org/SpecialPlaneCurves_dir/Cusp_dir/cusp.html Xah xah@... http://xahlee.org/PageTwo_dir/more.html...
Just created a page on curvature and tangent circle. See http://xahlee.org/SpecialPlaneCurves_dir/Curvature_dir/curvature.html the interesting idea is the...
i just learned that the locus of cusps of parallel curves is the evolute of the given curve. this is interesting, because it is a alternative definition of ...
Yes,Xah, I also found it intriguing... the base circle is evolute of all parallel involutes, in perhaps the simplest 2D plane example. In fact,this is how...
I added a photo page on Curlicue. See http://xahlee.org/SpecialPlaneCurves_dir/Curlicue_dir/curlicue.html has anyone seen interesting examples? i know that...
This is just to describe the construct of the curve and then I want to ask what kind of curve is it, is it a parabola? Secondly how can I get into the math of...
added a folium of Descartes stamp! http://xahlee.org/SpecialPlaneCurves_dir/FoliumOfDescartes_dir/ foliumOfDescartes.html anyone know other stamps featuring...
the one in mma version 2 is here: http://xahlee.org/SpecialPlaneCurves_dir/Seashell_dir/index.html formula is: x = 2*(1 - E^(u/(6*Pi)))*Cos[u]*Cos[v/2]^2, y =...
I am new in this group. I am a Spanish math teacher in a secondary school and I have a question about a curve. Let P mover on the ellipse x^2/a^2+y^2/b^2 = 1...
1) Is there a relationship between the focus of a parabola, its latus rectum, and its evolute? 2) The evolute of the spiral x= cost + tsint, y= sint - tsint...
... by definition there is a relation between the focus and the latus rectum of a parabola. As to focus and its evolute, i suppose so, if not direct. ... the...
1) Is there a relationship between the focus of a parabola, its latus rectum, and its evolute? The 1.5 power curve has a cusp at focus. 2) The evolute of the...
An intersting 2D locus, however, I don't know its name. Perhaps the parameteric form is simpler. It is not difficult to derive a relation between th and an...
just made an update to the breather surface, with graphing calc file & Mathematica file. http://www.xahlee.org/surface/breather_p/breather_p.html Xah ☄...
just created this page: http://xahlee.org/Whirlwheel_dir/reflecting_disks/reflecting_disks.html a photo gallery of reflecting disks. (radio dishes, solar...
There was a toy that had a virtual pig floating in air. There was an actual pig at the base of the toy and his virtual image was at the focus of a parabolic...
Breather breathtaking indeed !! Allow me acomment about related Three soliton surface with K= -1. One sees K > 0 areas in the peripheral regions of the...
Better to say Reflector dishes instead of reflecting disks. The TV dish receiver is not necessarily parabolic, since the focus is below the center of the dish...
Having problems with message search?
Fill out this form to ensure your group is one of the first to be migrated to the new message search system.
