Here's my question about sigmas. It will expose my ignorance, but at the same time the answer might help me visualize how ECM works.
Let's say you are running curves on a composite number that has only 2 rather large prime factors, and a lucky curve found one of those factors. Is the sigma that found that factor the only sigma that could have found it, or are there a number of different sigmas that could have found that same factor?
