A letter from the Republic of Bashkortostan of the Russian Federation was to Prof. Hamlet Isakhanli on the occasion of his 70th jubilee. The letter was signed by 30 prominent mathematicians, mechanic scientists and specialists. In the letter, it is mentioned that specialists, for who Prof. Hamlet Isakhanli acted as a scientific supervisor for dissertations, gained achievements in Russia, the USA, Israel, Turkey and other countries. Moreover, the letter involves an appreciation for Prof. Hamlet Isakhanli’s performance in science and poetry.