1. Ivan Salabashev

2. Biography
Ivan Salabashev was born in Stara Zagora on January the 7th He graduated from local secondary school, then continued his education in high school in Tabor (Czech Republic) , and Prague - in 1872 graduated mathematics at Prague Polytechnic in
From 1877 to He is a teacher in Bolgrad Highschool (Bessarabia), and then returned to Bulgaria and take an active part in public political life as minister in several governments. Member of the District Assembly of Eastern Rumelia. Head of office in the department of Education. Member of the Supreme Court.
participated in editing the journal "Science"and the"Southern Bulgaria. Member of the Bulgarian Literary Society he was the director of Justice in Eastern Rumelia ­1888 г. settled in Kazanlak, dealing with trade of rose oil.He constructed a factory for rose oil. In Kazanlak he creates chess club.Except , as a politician he was known as a chess figure. The first president of the Sofia Chess Club, created on the 1st of February 1922.
He is the minister of Finances in the Cabinet of Stambolov.

3. He is minister of justice and finances in the cabinet of Stambolov He is founder ,president and председател и honorary member of the Physico-Mathematical Society in Sofia He is minister of the finances of the Cabinet of Malinov Bulgarian minister counselor in Vienna . Ivan Salabashev died on the 14th of June 1924 in Sofia.

4. The context was the Treaty of Berlin of 1878
The context was the Treaty of Berlin of Bulgaria had gained independence from the Ottoman Empire in possession of a huge swathe of territory in the southern Balkans; the western Great Powers felt that this would give Russia too much influence and divided it three ways, with Macedonia going back to Ottoman control, a much smaller Bulgarian principality set up with its capital in Sofia, and an even smaller autonomous province called Eastern Rumelia, with its capital at Plovdiv (then called Philippopolis in English).

5. 1878

6. Under the Constituting, The parliament had to elect a Standing Committee of 10 members. Each deputy could vote for persons, and 47 deputies out of 56 took part in the vote. It turned out that 30 of them were of Bulgarian nationality and the goal was to bring as many of them as possible into the Standing Committee. Using his mathematical skills, Salabashev solved the above combinatorial problem, and as a result of his optimal solution all places in the Standing Committee were taken by Bulgarian deputies .

7. This Combinatorial problem was solved by Salabashev
The problem is this:
Given a set A = {a1, a2, ..., a10}, find 30 subsets Ai, each with 6 elements, such that each element of A belongs to exactly 10 of the subsets Ai.

8. Made By: Ivelina Krasimirova Georgieva SOU”Zheleznik” Stara Zagora
Bulgaria