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Whenever I use latex in my posts, I get the source part of it too. I believe we can post without that part appearing in the post. How?
dx said:dx, dy or dz or any other infinitesimals are not finite quantities. You cannot assign a definite value to them and you cannot compare their sizes. For physics and engineering, you can think of them as 'sufficiently small' quantities (so that you get the accuracy you desire, or you can pass to the limit in an ideal situation). This is of course, not mathematically rigorous. Take the pythagorean theorem for example. On a curved 2 dimensional surface, ds^2 = dx^2 + dy^2 describes the geometry of the surface at a 'sufficiently small' area. Hm.. actually, I am kinda confused.. the above equation seems to imply that ds^2 is somehow larger than the other two.. but that would be meaning less, ds is an infinitesimal length, just like the other two..help..
dx said:maybe its a browser problem..