Ideal value = number of exercises n Error n Error decreases with the increase of the number of exercises. For me, she is my ideal value, but I have repeatedly thought that I can make the error closer to 0 ... To be correct, I have not fully understood her, and I am not sure whether she is really suitable for me, but I am confident that this ideal value can be approached by my efforts and patience. In fact, isn't your relationship with her (him) the same? Can you see clearly whether the other person can touch her (his) innermost thoughts? Isn't it also approximated by the great n and the correct one? In fact, isn't the ability to know yourself the same?