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Elliptic curves, points, zooming
Not a Problem
Hi
I've noticed a problem. I plotted the elliptic curve y^2 = x^3  x + 1 and added a point P. When I zoom in and out, P moves along the curve. I've tried fixing the object but it still happens. It's the same if I use the mouse or the onscreen zoom buttons.
It doesn't happen with parabolas y=x^2 or y^2=x.
I'm using classic Geogebra v6 on Linux. The same thing happens when using the online version in Chrome browser.
I don't remember this problem last time I plotted some elliptic curves a few weeks back, but I could have overlooked it then.
Thansks
Ed
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I confirm in ver5.0.445 windows7
Sorry, that's expected
That's interesting and unexpected  to me anyway :) . It makes it difficult to play around with the groups arising from elliptic curves. What is the advantage in having that happen?
Hi,
workaround :
see in script of Uptdate of point C_1
When using the workaround the points look stable. But when I zoom out a lot the points are not stable anymore. And when I use a elliptic curve with two branches (f.e. y^2=x^3x) than the points P and PP will swap from one branch to the other branch.
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