Q: Information: - The term figurate number is used by different writers for members of different sets of numbers, generalizing from triangular numbers to different shapes (polygonal numbers) and different dimensions (polyhedral numbers). The term can mean - Geometry (from the ; "geo-" "earth", "-metron" "measurement") is a branch of mathematics concerned with questions of shape, size, relative position of figures, and the properties of space. A mathematician who works in the field of geometry is called a geometer. - A triangular number or triangle number counts the objects that can form an equilateral triangle, as in the diagram on the right. The th triangular number is the number of dots composing a triangle with dots on a side, and is equal to the sum of the natural numbers from 1 to . The sequence of triangular numbers , starting at the 0th triangular number, is - In mathematics, a polygonal number is a number represented as dots or pebbles arranged in the shape of a regular polygon. The dots are thought of as alphas (units). These are one type of 2-dimensional figurate numbers. - A heptagonal number is a figurate number that represents a heptagon . The n - th heptagonal number is given by the formula \ frac ( 5n ^ 2 - 3n ) ( 2 ) . The first few heptagonal numbers are : 1 , 7 , 18 , 34 , 55 , 81 , 112 , 148 , 189 , 235 , 286 , 342 , 403 , 469 , 540 , 616 , 697 , 783 , 874 , 970 , 1071 , 1177 , 1288 , 1404 , 1525 , 1651 , 1782 , ... ( sequence A000566 in OEIS ) - The Multinational Aircrew Electronic Warfare Tactics Facility Polygone - POLYGON is an Electronic Warfare Tactics Range located on the border between Germany and France. It is a tri-national facility operated by France, Germany and the United States. - In geometry, a heptagon is a seven-sided polygon or 7-gon. Given the information above, choose from the list below the object entity that exhibits the relation 'subclass of' with the subject 'heptagonal number'. Choices: - diagram - facility - field - geometry - heptagon - mathematician - mathematics - number - polygon - polygonal number - position - sequence - shape - sum - term - thought - type - warfare
A: polygonal number

Q: Information: - Pohang Steelers is a South Korean professional football club based in Pohang, North Gyeongsang. They were originally called "Pohang Steelworks", after the Pohang Iron and Steel Company that owned it. The club was founded in 1973 and is one of Korean football's most successful sides. - The K League Classic is one of South Korea's professional association football leagues. At the top of the South Korean football league system, it is the country's highest and most prestigious level of football competition currently contested by 12 clubs. - South Korea, officially the Republic of Korea (ROK), is a sovereign state in East Asia, constituting the southern part of the Korean Peninsula. - Daegu Football Club, commonly referred to as Daegu FC (Korean: FC), is a South Korean professional football club based in Daegu. The club was founded as a community club at the end of 2002, and the club made their K League Classic debut in 2003. Historically, Daegu have always placed in the lower reaches of the K League Classic. Their best season in the K League Classic to date was 2006, when they finished in 7th place (out of 14 teams), as well as reaching the quarter-finals of the Korean FA Cup. Two years later, in 2008, Daegu reached the semi-finals of the Korean FA Cup, but lost to the Pohang Steelers. At the end of the 2013 season Daegu was relegated to the K League Challenge. They were promoted back to the K League Classic in 2016. - Daegu, (, , literally 'large hill') formerly spelled Taegu, and officially known as the Daegu Metropolitan City, is a city in South Korea, the fourth largest after Seoul, Busan, and Incheon, and the third largest metropolitan area in the nation with over 2.5 million residents. Daegu is the principal city of the surrounding North Gyeongsang Province. The two areas combined are often referred to as Daegu-Gyeongbuk, with a total population of over 5 million. - Changwon is the capital city of Gyeongsangnam-do, South Korea. Changwon is the 8th most populated city in South Korea, with an established population of 1,089,039 people in 2010. It encompasses a land area of on the southeastern coast of South Korea. The population of southeastern Korea, including the city of Busan, is more than 6,478,000. Changwon is known as a heavy industrial city. The city only covers 7% of Gyeongsangnam-do province, also known as Gyeongnam, but holds 33.6% of its population; it also accounted for 38.5% of the total 2.1821 trillion won budget of the Gyeongnam province. - The K League Challenge is a South Korean professional league for association football clubs. Being the second tier of the South Korean football league system, it is currently contested by ten clubs, and operates on a system of promotion and relegation with the K League Classic. - South Gyeongsang Province is a province in the southeast of South Korea. The provincial capital is at Changwon. It is adjacent to the major metropolitan center and port of Busan. There is UNESCO World Heritage Site Haeinsa, a Buddhist temple that houses the "Tripitaka Koreana" and attracts many tourists. Automobile and petrochemical factories are largely concentrated along the southern part of the province, extending from Ulsan through Busan, Changwon, and Jinju. - Seo Sang - Min ( born July 25 , 1986 ) is South Korean footballer who plays as a midfielder in Jeonbuk Hyundai Motors . He is the first player who records 2 goals in debut match and season 's opening match for 26 - year - old League History . His first league match was opening match of K - League 2008 , Gyeongnam FC versus Daegu FC . - The Korean FA Cup is a national cup knockout competition involving K League Classic, K League Challenge, National League, and various amateur and university-level clubs, which is held annually by the Korea Football Association (KFA). Its previous format began in 1921, as the All Joseon Football Tournament (19211940) and became the National Football Championship (19462000), but the FA Cup in it present format began in 1996. The KFA merged its cup competition with the FA Cup in 2000. The winner gains entry to the Asian Champions League. - Gyeongnam FC is a South Korean football club based in Gyeongsangnam-do. Its home stadium is in Changwon, the capital of South Gyeongsang Province. Gyeongnam FC was founded in 2006 and joined the K-League as its 14th club for the 2006 season. Given the information above, choose from the list below the object entity that exhibits the relation 'place of birth' with the subject 'seo sang-min'. Choices: - best - capital city - changwon - daegu - date - gyeongsang - hill - home - jinju - korea - most - of - pohang - seoul - south korea - southeast - temple - winner
A: seoul