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The group SU(3) is a subgroup of group U(3), the group of all 3×3 unitary matrices. The unitarity condition imposes nine constraint relations on the total 18 degrees of freedom of a 3×3 complex matrix. Thus, the dimension of the U(3) group is 9. Furthermore, multiplying a U by a phase, e iφ leaves the norm invariant.
The Su-9 was developed from earlier work on a developmental aircraft designated T-3, to which the Su-9 was nearly identical. Internally at Sukhoi, the Su-9 was known as the T-43. The delta wing of the Su-9 was adopted because of its lower drag in the supersonic flight regime. Its greater volume also allowed a modest fuel capacity increase ...
District 10 (Vietnamese: Quận 10) is an urban district of Ho Chi Minh City, the largest city in Vietnam. As of 2017, the district had a population of 239,053 and an area of 5.7181 km 2, occupying 0.24% of the city's total land area. [1] It is divided into 15 small subsets which are called wards (phường), numbered from Ward 1 to Ward 15.
Ninh Bình is a province of Vietnam in the Red River Delta region of the northern part of the country. [4] The province is famous for a high density of natural and cultural attractions, including reserved parks in Cúc Phương National Park and Vân Long, grotto caves and rivers in Tràng An, Tam Cốc-Bích Động and Múa Caves, historic monuments in the Hoa Lư ancient capital, Vietnam's ...
1895 – Eugene Bullard, American pilot (d. 1961) [10] 1897 – M. Bhaktavatsalam, Indian lawyer and politician, 6th Chief Minister of Madras State (d. 1987) 1898 – Tawfiq al-Hakim, Egyptian author and playwright (d. 1987) 1898 – Joe Sewell, American baseball player (d. 1990) 1899 – Bruce Catton, American historian and author (d. 1978)
Lý Thường Kiệt (李 常 傑; 1019–1105), real name Ngô Tuấn (吳 俊), was a Vietnamese general and admiral of the Lý dynasty. [1] He served as an official through the reign of Lý Thái Tông , Lý Thánh Tông and Lý Nhân Tông and was a general during the Song–Lý War .
[9] [10] France reduced Vietnam to a French dependency in 1883, followed by an occupation of Japanese army. Political upheaval and communist insurrection put an end to the monarchy after World War II, and the country was proclaimed a republic in 1945. Internal conflicts between communists and non-communists broke out immediately.
Lý Tự Trọng (20 October 1914 in Thailand [1] – 21 November 1931 in Saigon; born Lê Hữu Trọng) was a Vietnamese revolutionary, executed by the French when he was only 17 years old. [2] He is considered to be a revolutionary martyr.