# Poincare Conjecture – on contribution

There are so many calculations/divisions/guesses/conjectures on who has made the biggest contribution to solve the problem or how much value the Chinese mathematicians has contributed to the final solution, after the news Chinese mathematicians put final pieces in global puzzle – Poincare conjecture came out.

This is a metaphor. Funny.

A Stage Play of the P Conjecture: Perelman vs Cao-Zhu-Yau

Stage 0: Poincare, the prophet, told people that there exists a tunnel which would go from this side of the mountain to the other side of the mountain.

Stage 1: Poincare announced that he found a mistake and that the tunnel he found could not go through the mountain but maintained his belief that there still exists such a tunnel yet to be found. This conjectured tunnel was then named “Tunnel of Poincare”.

Stage 2: Many pioneers went out trying to find such a tunnel but failed. However, some of them (Stallings, Zeeman, Smale, Freedman) did find similar tunnels in other mountains.

Stage 3: Perelman, the monk, told people that he had found Tunnel of Poincare in the mountain that Poincare himself failed, and that he laid out 30 trail marks at various places in the tunnel so that other people could go through by themselves.

Stage 4: Cao and Zhu were teamed up as an expedition to explore the feasibility of Perelman’s tunnel. They were able to go through indeed and they laid out more than 300 trail marks along the tunnel which eases the pass greatly.

Stage 5: Yau, the king, announced that the ultimate discovery of Poincare Tunnel was finally made by Cao and Zhu, and emphasized the importance of the “Perelman Method” (called by Cao-Zhu “Hamilton and Perelman’s Ricci flow theory”).

Stage 6: Celebration.

A more serious calcualtion. Serious!

You’s better divide Poncare conjecture into 2 parts;
1, high dimension (n>4), proved by S. Smale (and Stalling, but mainly S. Smale);

2, 3-D. In the late 70’s, W. Thurston made his famous geometrization conjecture for 3-M compact manifold. He completely classify 3-D manifold, and proven for a large class of manifolds—-the so-called Haken manifolds. But not general 3-D. His method is topological and some of the details hadn’t been written down until now. (that was why some big guys, such as J.P.Serre, the first winner of the Abel criticize Thurston’s Fields medal). Geometrization conjecture is more generel than Poincare conjecture, the xxxxer includes the latter.

3, 4-D. Mike Freedman proved it in the topological category, but not in the smooth category. S. Donaldson used some idea from Yang-Mills gauge theory (your fileds, hehe, you can say more) found astonishing properties of the smooth 4-D manifolds in the early 80’s. but 4-D is MUCH HARDER than 3-D case. Because for 3-D, at least we had Thurston’s conjecture. But for 4-D, so far, we still have not any even conjecture for the classification of the smooth compact 4-D manifolds. 4-D poincare conjecture is only a special case. BTW, Hamilton’s Ricci Flow is also considered as a way to approach 4-D poincare conjecture.

In my personal opinion. You’d better add between youe stage 2 and 3 R. Hamilton’s work. in 1982, R. Hamilton INVENTED Ricci flow and proved great theorem in 3-D manifold. His method was geometrical analysis, of course S.T.Yau was very interested in. S.T.Yau realized the potential power of the Ricci Flow so he suggested Hamilton try Poincare conjecture. Please note, S.T. Yau could not do Ricci Flow by himself. Because as a Fields medal, he should not join a field which was created by other people—his friend R. Hamilton. What he could do is to support it and ask his students do it. Yau also suggested Hamilton try to find the Harnack property in the Ricci Flow—-the Li-Yau inequality in Ricci Flow. After several hard work, finally, Hamilton found it. In 1995, R. Hamilton propose a great proposal—–in the first time, R. Hamilton raised the “finite time singularities in the Ricci flow”. IN that 100 pages long paper, R. Hamilton propose a way to prove 3-D poincare conjecture. That is why 1996-1997, Yau tried to push Chinese mathematision work in Ricci Flow, because R. Hamilton make the dream of proving 3-D poincare conjecture as a reasonably possibility.

I have to say, R. Hamilton himself can not finish his progrom. Just couldn’t. Becasue in Perelman’s papers, it needed some methods which R. Hamilton did not know. That is why it was G. Perelman win.

I say again, I said it several times: The most important contribution belong to R. Hamilton and G. Perelman, at least 90%!

It is so ridiculous that Yang Le, a person hasn’t been doing research more than 10 years, and knows NOTHING about geometry, he claimed Chinese mathematicion make 30% contribution. It is ridiculous, just ridiculous. Cao-Zhu’s work is great, but is demaged by Yang Le’s stupid words.

Who will get the one million dollar? Does it matter?

## 4 thoughts on “Poincare Conjecture – on contribution”

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