I, the copyright holder of this work, hereby publish it under the following license:

This file is licensed under the Creative Commons Attribution-Share Alike 4.0 International license.

You are free:

• to share – to copy, distribute and transmit the work
• to remix – to adapt the work

Under the following conditions:

• attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
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https://creativecommons.org/licenses/by-sa/4.0CC BY-SA 4.0 Creative Commons Attribution-Share Alike 4.0 truetrue

Dear Juta,

I am a close collaborator of Professor Dinh Tien Cuong. He authorizes me to put the new version of his photo on wiki. I did this two weeks ago one, but you reverted the new photo a day later. I did it again last week, but I find out that you reverted the new photo several days later.

Would you like please keep the photo that I submit to wiki (before your last revert) ?

Thank you very much in advance.

User vietanh_1974 Professional Page: http://math.univ-lille1.fr/~vnguyen/