The International Mathematical Olympiad (IMO) is a mathematical olympiad for pre-university students, and is the oldest of the International Science Olympiads.^[1] It is “the most prestigious” mathematical competition in the world. The first IMO was held in Romania in 1959. It has since been held annually, except in 1980. More than 100 countries participate. Each country sends a team of up to six students,^[2] plus one team leader, one deputy leader, and observers.^[3]

The content ranges from extremely difficult algebra and pre-calculus problems to problems in branches of mathematics not conventionally covered in secondary or high school and often not at university level either, such as projective and complex geometry, functional equations, combinatorics, and well-grounded number theory, of which extensive knowledge of theorems is required. Calculus, though allowed in solutions, is never required, as there is a principle that anyone with a basic understanding of mathematics should understand the problems, even if the solutions require a great deal more knowledge. Supporters of this principle claim that this allows more universality and creates an incentive to find elegant, deceptively simple-looking problems which nevertheless require a certain level of ingenuity, often times a great deal of ingenuity to net all points for a given IMO problem.

The selection process differs by country, but it often consists of a series of tests which admit fewer students at each progressing test. Awards are given to approximately the top-scoring 50% of the individual contestants. Teams are not officially recognized—all scores are given only to individual contestants, but team scoring is unofficially compared more than individual scores.^[4] Contestants must be under the age of 20 and must not be registered at any tertiary institution. Subject to these conditions, an individual may participate any number of times in the IMO.^[5]

History

The first IMO was held in Romania in 1959. Since then it has been held every year (except in 1980, when it was cancelled due to internal strife in Mongolia)^[6] It was initially founded for eastern European member countries of the Warsaw Pact, under the USSR bloc of influence, but later other countries participated as well.^[2] Because of this eastern origin, the IMOs were first hosted only in eastern European countries, and gradually spread to other nations.^[7]

Sources differ about the cities hosting some of the early IMOs. This may be partly because leaders and students are generally housed at different locations, and partly because after the competition the students were sometimes based in multiple cities for the rest of the IMO. The exact dates cited may also differ, because of leaders arriving before the students, and at more recent IMOs the IMO Advisory Board arriving before the leaders.^[8]

Several students, such as Lisa Sauermann, Reid W. Barton, Nicușor Dan and Ciprian Manolescu have performed exceptionally well in the IMO, winning multiple gold medals. Others, such as Terence Tao, Artur Avila, Grigori Perelman, Ngô Bảo Châu and Maryam Mirzakhani have gone on to become notable mathematicians. Several former participants have won awards such as the Fields Medal.^[9]

Scoring and format

The competition consists of 6 problems. The competition is held over two consecutive days with 3 problems each; each day the contestants have four-and-a-half hours to solve three problems. Each problem is worth 7 points for a maximum total score of 42 points. Calculators are not allowed. Protractors are not allowed relatively recently.^[10] Unlike other science olympiads, the IMO has no official syllabus and does not cover any university-level topics. The problems chosen are from various areas of secondary school mathematics, broadly classifiable as geometry, number theory, algebra, and combinatorics. They require no knowledge of higher mathematics such as calculus and analysis, and solutions are often elementary. However, they are usually disguised so as to make the solutions difficult. The problems given in the IMO are largely designed to require creativity and the ability to solve problems quickly. Thus, the prominently featured problems are algebraic inequalities, complex numbers, and construction-oriented geometrical problems, though in recent years, the latter has not been as popular as before because of the algorithmic use of theorems like Muirhead's Inequality, and Complex/Analytic Bash to solve problems.^[11]

Each participating country, other than the host country, may submit suggested problems to a Problem Selection Committee provided by the host country, which reduces the submitted problems to a shortlist. The team leaders arrive at the IMO a few days in advance of the contestants and form the IMO Jury which is responsible for all the formal decisions relating to the contest, starting with selecting the six problems from the shortlist. The Jury aims to order the problems so that the order in increasing difficulty is Q1, Q4, Q2, Q5, Q3 and Q6, where the First day problems Q1, Q2, and Q3 are in increasing difficulty, and the Second day problems Q4, Q5, Q6 are in increasing difficulty. The team leaders of all countries are given the problems in advance of the contestants, and thus, are kept strictly separated and observed.^[12]

Each country's marks are agreed between that country's leader and deputy leader and coordinators provided by the host country (the leader of the team whose country submitted the problem in the case of the marks of the host country), subject to the decisions of the chief coordinator and ultimately a jury if any disputes cannot be resolved.^[13]

Selection process

The selection process for the IMO varies greatly by country. In some countries, especially those in East Asia, the selection process involves several tests of a difficulty comparable to the IMO itself.^[14] The Chinese contestants go through a camp.^[15] In others, such as the United States, possible participants go through a series of easier standalone competitions that gradually increase in difficulty. In the United States, the tests include the American Mathematics Competitions, the American Invitational Mathematics Examination, and the United States of America Junior Mathematical Olympiad/United States of America Mathematical Olympiad, each of which is a competition in its own right. For high scorers in the final competition for the team selection, there also is a summer camp, like that of China.^[16]

In countries of the former Soviet Union and other eastern European countries, a team has in the past been chosen several years beforehand, and they are given special training specifically for the event. However, such methods have been discontinued in some countries.^[17]

Awards

The participants are ranked based on their individual scores. Medals are awarded to the highest ranked participants; slightly fewer than half of them receive a medal. The cutoffs (minimum scores required to receive a gold, silver, or bronze medal respectively) are then chosen so that the numbers of gold, silver and bronze medals awarded are approximately in the ratios 1:2:3. Participants who do not win a medal but who score 7 points on at least one problem receive an honorable mention.^[18]

Special prizes may be awarded for solutions of outstanding elegance or involving good generalisations of a problem. This last happened in 1995 (Nikolay Nikolov, Bulgaria) and 2005 (Iurie Boreico), but was more frequent up to the early 1980s.^[19] The special prize in 2005 was awarded to Iurie Boreico, a student from Moldova, for his solution to Problem 3, a three variable inequality.

The rule that at most half the contestants win a medal is sometimes broken if it would cause the total number of medals to deviate too much from half the number of contestants. This last happened in 2010 (when the choice was to give either 226 (43.71%) or 266 (51.45%) of the 517 contestants (excluding the 6 from North Korea — see below) a medal),^[20] 2012 (when the choice was to give either 226 (41.24%) or 277 (50.55%) of the 548 contestants a medal), and 2013, when the choice was to give either 249 (47.16%) or 278 (52.65%) of the 528 contestants a medal. In these cases, slightly more than half the contestants were awarded a medal.^[21][22]

Penalties and bans

North Korea was disqualified twice for cheating, once at the 32nd IMO in 1991^[23] and again at the 51st IMO in 2010.^[24] However, the incident in 2010 was controversial.^[25][26] There have been other cases of cheating where contestants received penalties, although these cases were not officially disclosed. (For instance, at the 34th IMO in 1993, a contestant was disqualified for bringing a pocket book of formulas, and two contestants were awarded zero points on second day's paper for bringing calculators.^[27])

Russia has been banned from participating in the Olympiad since 2022 as a response to its invasion of Ukraine.^[28] Nonetheless, a limited number of students (specifically, 6) were allowed to take part in the competition, but only remotely and with their results being excluded from the medal tally.^[28] There has not been other country being banned yet on similar ground.

Summary

Zdroj:https://en.wikipedia.org?pojem=IMOTC
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	Venue	Year	Date	Top-ranked country[29]	Refs
1	Brașov and Bucharest	1959	July 21–31[30]	Romania	[31]
2	Sinaia	1960	July 18–26	Czechoslovakia	[31]
3	Veszprém	1961	July 6–16	Hungary	[31]
4	České Budějovice	1962	July 7–15		[31]
5	Warsaw and Wrocław	1963	July 5–13	Soviet Union	[31]
6	Moscow	1964	June 30 – July 10		[31]
7	East Berlin	1965	July 3–13		[31]
8	Sofia	1966	July 1–14		[31]
9	Cetinje	1967	July 2–13		[31]
10	Moscow	1968	July 5–18	East Germany	[31]
11	Bucharest	1969	July 5–20	Hungary	[31]
12	Keszthely	1970	July 8–22		[31]
13	Žilina	1971	July 10–21		[31]
14	Toruń	1972	July 5–17	Soviet Union	[31]
15	Moscow	1973	July 5–16		[31]
16	Erfurt and East Berlin	1974	July 4–17		[31]
17	Burgas and Sofia	1975	July 3–16	Hungary	[31]
18	Lienz	1976	July 7–21	Soviet Union	[31]
19	Belgrade	1977	July 1–13	United States	[31]
20	Bucharest	1978	July 3–10	Romania	[31]
21	London	1979	June 30 – July 9	Soviet Union	[31]
	The 1980 IMO was due to be held in Mongolia. It was cancelled, and split into two unofficial events in Europe.[32]
22	Washington, D.C.	1981	July 8–20	United States	[31]
23	Budapest	1982	July 5–14	West Germany	[31]
24	Paris	1983	July 1–12		[31]
25	Prague	1984	June 29 – July 10	Soviet Union	[31]
26	Joutsa	1985	June 29 – July 11	Romania	[31]
27	Warsaw	1986	July 4–15	Soviet Union  United States	[31]
28	Havana	1987	July 5–16	Romania	[31]
29	Sydney and Canberra	1988	July 9–21	Soviet Union	[31]
30	Braunschweig	1989	July 13–24	China	[31]
31	Beijing	1990	July 8–19		[31]
32	Sigtuna	1991	July 12–23	Soviet Union	[31]
33	Moscow	1992	July 10–21	China	[31]
34	Istanbul	1993	July 13–24		[31]
35	Hong Kong	1994	July 8–20	United States	[31]
36	Toronto	1995	July 13–25	China	[33]
37	Mumbai	1996	July 5–17	Romania	[34]
38	Mar del Plata	1997	July 18–31	China	[35]
39	Taipei	1998	July 10–21	Iran	[36]
40	Bucharest	1999	July 10–22	China  Russia	[37]
41	Daejeon	2000	July 13–25	China	[38]
42	Washington, D.C.	2001	July 1–14		[39]
43	Glasgow	2002	July 19–30		[40]
44	Tokyo	2003	July 7–19	Bulgaria	[41]
45	Athens	2004	July 6–18	China	[42]
46	Mérida	2005	July 8–19		[43]
47	Ljubljana	2006	July 6–18		[44]
48	Hanoi	2007	July 19–31	Russia	[45]
49	Madrid	2008	July 10–22	China	[46]
50	Bremen	2009	July 10–22		[47]
51	Astana	2010	July 2–14		[48]
52	Amsterdam	2011	July 12–24		[49]
53	Mar del Plata	2012	July 4–16	South Korea	[50]
54	Santa Marta	2013	July 18–28	China	[51]
55	Cape Town	2014	July 3–13		[52]
56	Chiang Mai	2015	July 4–16	United States	[53]
57	Hong Kong	2016	July 6–16		[54]