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Saccheri quadrilaterals. A Saccheri quadrilateral is a quadrilateral with two equal sides perpendicular to the base.It is named after Giovanni Gerolamo Saccheri, who used it extensively in his 1733 book Euclides ab omni naevo vindicatus (Euclid freed of every flaw), an attempt to prove the parallel postulate using the method reductio ad absurdum.
A mind map is a diagram used to visually organize information into a hierarchy, showing relationships among pieces of the whole. [1] It is often based on a single concept, drawn as an image in the center of a blank page, to which associated representations of ideas such as images, words and parts of words are added.
After arriving in southern Vietnam, Đào Duy Từ attempted to meet Lord Nguyễn Phúc Nguyên but failed. After that, Từ became a worker for a landlord named Chúc Trịnh Long in Tùng Châu (present day Bồng Sơn, Bình Định Province) in order to get close to Trần Đức Hòa, a neighbor of Chúc Trịnh Long and a mandarin of Lord Nguyễn Phúc Nguyên.
The 16-cell is the second in the sequence of 6 convex regular 4-polytopes (in order of size and complexity). [a]Each of its 4 successor convex regular 4-polytopes can be constructed as the convex hull of a polytope compound of multiple 16-cells: the 16-vertex tesseract as a compound of two 16-cells, the 24-vertex 24-cell as a compound of three 16-cells, the 120-vertex 600-cell as a compound of ...
Tu Ky (Vietnamese: Tứ Kỳ) is a district of Hải Dương province in the Red River Delta region of Vietnam. As of 2003 the district had a population of 167,664. The district covers an area of 168 km 2 (65 sq mi). The district capital lies at Tứ Kỳ. [1]
Hoàng Tứ Duy (also known as Duy "Dan" Hoang) is a Vietnamese-born American democracy activist. He is currently the executive director for Viet Tan, an unsanctioned pro-democracy political movement in Vietnam. [1] [2] Before becoming a full-time democracy activist, he worked as an investment banker for over 10 years. He has testified before ...
Việt Minh flag. In 1944, Châu joined the anti-French and anti-Japanese "resistance" (khang chien), that is, the Việt Minh.He followed two older brothers and a sister. [9] [10] [11] Then considered a popular patriotic organization, the Việt Minh emphasized Vietnamese nationalism.
He also reportedly wrote Hồng Nghĩa giác tư y thư (洪義覺斯醫書), partly using Nôm verse. [ 7 ] Tuệ Tĩnh died around 1389 in Nanjing and was buried there, although part of the inscription on his tombstone beseeches visitors to take his remains back to Vietnam. [ 4 ]