Recent content by Xuejun

Thanks Jing2178. Good point. Actually before trying to seek help online, I was already aware that one couldn't draw any absolute certain conclusion on issue like this; at best one could only estimate the situation in terms of probability. But speaking of probability, I suppose the only person...

Of course I've been learning Math since then, but I feel like my mind wasn't as sharp and quick as usual, and my memory wasn't good as old times as well. I know there are other possible alternative explanations, and the reasons might be quite complex, but when frustrated, I just couldn't help...

Hi everybody! I'm writing to seek help, very seriously and sincerely. As you can read from the title, my brain was hit back in May, 2009. Strange as it may sound, I realized how horrible the ramification of this accident was after more than a year, i.e., in fall, 2010. Then I started to worry...