# 6月8日聚会 张益唐问答录

6月8日聚会  张益唐问答录

HL先生：我在网上看到，你早先的博士论文是做代数几何的（张：对）。你刚才说的经典的那些是指筛法吧，（张：对）我原来记得在陈景润做1+2时，魏伊说这达到了筛法的顶峰。但你的结果说明那还不是顶峰，你能把筛法加上后来的代数几何。

HL先生：也许你所做的意义更大，难度可能各有千秋。但你等于是证明有这回事，让大家不要做了，以前都没有这个具体的数值，现在有了七千万这个数，至于能不能压到2是另外一回事。

（众插话：还是好好去做数学。）

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is an honor for me, an old math major to be sitting here with Professor Zhang .He just does a remarkable thing, wonderful thing, in the field of mathematical where it is difficult to make much progress.

If you understand his paper, you will understand that he has shown that there is a number, which solved this problem, and the number is less than seventy million, actually we all believe that number is 2. So we have some distance to go, from seventy million down to 2. But that is not the worst situation in mathematics. There is another difficult problem in a different area of math, and we know there is a number that solves that problem. But the number is so big you can’t even express it, beyond millions, beyond trillions. It has a special name, Graham’s Number , a very very big number. But we actually believe that the true solution to this problem is 6. So this is not the worst case in mathematics. But it is marvelous achievement. I congratulate Professor Zhang, it is an honor to be here with him and it is very happy to make some old friends who I have known for twenty years or more, although we lost in touch.

It’s pleasure to be here. Thank you.

 作 者 :张益唐 等 出 处 :北京之春 整 理 :2013年7月8日20:26