4 ms·
How does a twist x{d} being even equate to the integer d being even?
by rocqua 8y ago
How does a twist x{d} being even equate to the integer d being even?
- throwaway080383 8y agoThe twist x{d} is even as soon as d>0.
- rocqua 8y agoYes, but that doesn't mean the integer d is even.
- throwaway080383 8y agoI never say anything about d being even. Rather, as soon as d > 0, x{d} is even, so "almost all" x{d} are even. As you vary x and d, you cover all integers exactly once, so from this perspective, "almost all" integers are even. My point is that this is very similar to how elliptic curves are being counted here.