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Phan Bội Châu (Vietnamese: [faːn ɓôjˀ cəw]; 26 December 1867 – 29 October 1940), born Phan Văn San, courtesy name Hải Thụ (later changed to Sào Nam), was a pioneer of 20th century Vietnamese nationalism.
Born Đoàn Văn Nghĩa (段文義）in Tiên Lữ, Hưng Yên, Hoàng Hoa Thám (黃花探) was the better known adopted name whilst his nom-de-guerre was Đề Thám (提 探). [1] "Đề" is the shortened form of "Đề đốc" (提督), denoting the rank of a commander, an appellation adopted by Hoàng Hoa Thám as he was never commissioned ...
The regular hexagon has D 6 symmetry. There are 16 subgroups. There are 8 up to isomorphism: itself (D 6), 2 dihedral: (D 3, D 2), 4 cyclic: (Z 6, Z 3, Z 2, Z 1) and the trivial (e) These symmetries express nine distinct symmetries of a regular hexagon. John Conway labels these by a letter and group order. [4] r12 is full symmetry, and a1 is no ...